SELECTED EXCERPTS
OF CORRESPONDENCE,
CONCERNING THE DISCOVERY
OF NEPTUNE
Selected Excerpts of correspondence,
McA the McAlister collection, kept in the JCA, -transcript of J.C.Adams
material.
RGO Royal Greenwich Observatory’s Neptune file, at the UL, Cambridge
IoA Institute of Astronomy (Challis' collection) at the ULC.
T.C. – Trinity College Cambridge, Whewell manuscripts.
RAS Royal Astronomical Society library
R.S. The Royal Society library, Sedgwick letters
O.de P. Observatoire de Paris archive
Airy to Hussey 1834, Nov 23 3pp RGO
Observatory Cambridge
My dear
Sir,
I have
often thought of the irregularities of Uranus, and since the receipt
of your letter have looked more carefully to it. It is a puzzling
subject, but I give it as my opinion without hesitation that it
is not yet in such a state as to give the smallest hope of making
out the nature of any external action on the planet... But if it
were certain that there were any extraneous action, I doubt much
the probability of determining the place of a planet which produced
it. I am sure it could not be done till the nature of the irregularity
was well determined from several successive revolutions.
Airy to Bouvard
R O Greenwich 1837 Oct 12 RGO 4pp
Sir,
I have
received your letter of Oct 6, and am glad to find that you propose
to yourself to labour on the publication of new tables of Uranus.
At the same time I think that probably you would gain very much
in the accuracy of the reduced observations by waiting a short time
before you proceed with that part of your labour.... I have reduced
the observations made at Greenwich in 1836, in the same manner:
the volume containing these reductions will very soon by published.
You will thus have a year's observations made with the best instruments
in existence, far more completely reduced than any others which
are published. You may also know that I am engaged upon a general
reduction of the observation of planets made at Greenwich from the
commencement of Bradley's observation to the present time. It may,
perhaps, be years before I can furnish you with the places deduced
from these observations: but I am sure that you would find it advantageous
to wait for them... the errors of longitude are increasing with
fearful rapidity... I cannot conjecture what is the cause of these
errors, but I am inclined, in the present instance, to ascribe them
to some error in the perturbations... The subject of the correction
of the planetary tables is one which I have very much at heart.
Challis
to Airy RGO
Cambridge
Observatory Feb. 16. 1844
My dear
Sir,
I am exceedingly
obliged by your sending so complete a series of Tabular errors of
Uranus. Mr Adams had not dared to ask for more than the errors of
ten years. The list you have sent will give him the means of carrying
on in the most effective manner the enquiry in which he is engaged.
Airy to
Bouvard 2pp RGO
1844 June
27 Royal Obs, Greenwich
Sir,
I shall
send to you by post tomorrow two sheets of the printed reductions
of the Greenwich Planetary Observations which will probably contain
all that you desire relating to Uranus...
Challis
to Airy 2pp RGO
Cambridge
Observatory Sep. 22. 1845
My dear
Sir,
My friend,
Mr Adams, (who will probably deliver this note to you) has completed
his calculations respecting the perturbation of the orbit of Uranus
by a supposed ulterior planet, & has arrived at results, which
he would be glad to communicate to you personally if you could spare
him a few moments of your valuable time. His calculations are formed
on the observations you were so good as to furnish him with some
time ago, & from his character as a mathematician & his
practice in calculation, I should consider the deductions from his
premises to be made in a most worthy manner. If he should not have
the good fortune to see you at Greenwich he hopes to be allowed
to write to you on this subject.
Airy to
Challis Inst.ofAstron. V, + RGO copy
R.G.Obs
1845 September 29
My Dear
Sir,
I was,
I suppose, on my way from France when Mr Adams called here. At all
events I had not reached home and therefore to my regret I have
not seen him. Would you mention to Mr Adams that I am very much
interested with the subject of his investigations and that I should
be delighted to hear of them by letter from him.
Adams to
his brother George Cambridge 1845 Feb 26
JCA McA
35:12 not RGONE
My dear
George,
I am afraid
that I shall come in for the greatest share of the blame due to
the neglect of our correspondence as I believe it was my turn to
write...
I have
examined the instruments we have in our obsery. &
find there are some very good ones, but I have not been able to
make much use of them yet. The Comet has been easily visible with
a common Telescope. I found it myself with O'Bailly's telescope
about 3 weeks ago, but lately the weather has not been very favourable
& the light of the moon has also contributed to render it less
easily seen. It is now receding from the Earth so that there is
no chance of its being visible to the naked eye. Thomas wrote a
note a few days ago, for the first time this Term, so you see we
are all pretty much alike in the epistolatory line. Write again
very soon & tell me what you are doing in Euclid & Trigonometry
& also in English Composition Etc - I think I must send you
a few deductions fm. Euclid to be done & some applications of
Trigonometry, to take away some of the dryness of which you complain.
Hoping to hear again I remain your affectionate Brother
Adams to
brother George St John's College, July 10 1845
McA 35:12
My dear
George,
I am afraid
you will all think me very negligent for not having written since
my return to Cambridge - I found that the greater part of the business
of the British Assocn. was already over, but I came in for the latter
part of the feast, & had the pleasure of seeing for the first
time some of our greatest scientific men, Herschel, Airy, Hamilton,
Brewster Etc. wh. was my chief object in returning to Cambridge
so soon. I have become a life Member of the Assocn. & hope,
if spared, to form a more intimate acquaintance with these eminent
men at future meetings of the body. There were many men of Science
fm. the Continent who honoured us with their presence &, on
the whole, I understand this has been a most satisfactory meeting.
I am now working with my pupils as usual, but my labours are much
lighter than in term time, having no lectures to give...
Eugene
Bouvard, "New Tables of Uranus"
(in
Comptes Rendus Session Sept 1, 1845, xxi, 524):
The discordances
between the observations and the theory induce me to believe that
there is much probability in the idea proposed by my uncle, (Alexis
Bouvard, whose Tables of Uranus etc. were printed in 1821) as to
the existence of another planet, disturbing Uranus.
Adams to
parents
St John's
College McA Box 35:2 23rd Oct 1845
My dear Parents,
I just drop a line to
tell you of my safe arrival at Cambridge... Nothing worth mentioning
occurred on my journey to London, where I arrived luggage &
all very early on Tuesday morning. After waiting till about 2 a.m.
[!] for Thomas, I left for Greenwich to call on Mr Airy, who was
unfortunately not at home. I left a note for him, however, containing
a short statement of the results at which I had arrived, & returned
to London, where I found Thomas, who did not come before he had
done his day's work.
Airy to Adams 1845 November
5 JCA 2:2 2pp RGo copy
Sir,
I am very much obliged
by the paper of results which you left here a few days since, showing
the perturbations on the place of Uranus produced by a planet with
certain assumed elements. - The latter numbers are all extremely
interesting: I am not enough acquainted with Flamsteed's observations
about 1690 to say whether they have such an error, but I think it
extremely probable.
But I should be very glad
to know whether the assumed perturbations will explain the error
of radius vector of Uranus. This error is now very considerable
as you will be able to ascertain by comparing the normal equations,
given in the Greenwich Observations each year, for the time before
opposition with the times after opposition.
Herschel to Adams 1846
Jan 23 JCA 9:15 not RGONE
Dear Sir,
I take
the liberty of sending by you a work which if all it contains be
correct (and the author ... [about lunar theory and old eclipses]
.. If Laplace has really been mistaken a whole year in the Chaldean
eclipses - what becomes of the Lunar acceleration! ... you are quite
welcome to retain the book.
AGM of
RAS on 1846 Feb 13 (MNRAS VII pp.65-67)
The gold
medal was awarded to Airy for 'his recent publication of the reductions
of the Greenwich Planetary Observations from 1750 to 1830. .. it
rarely happens that so valuable a present is made by te practical
to the theoretical astronomer.
President
Captain Smyth said, 'The contents of this precious work are comprised
in a quarto volume of above 700 pages ... so may we, perhaps, date
a new epoch in planetary astronomy from the appearance of this great
work before you, since the desiderata in this department of the
sciences are rendered visible, and the necessity for exact instants,
a greater refinement of methods, and more delicate observations
made apparent.'
Airy to
William Whewell 1846 June 25 Trin Coll Lib.
The discordance
is increasing ... People's notions have long been turned to the
effects of an external planet, and upon this there are two remarkabled
calculations. One is by Adams of St John's (which in manuscript
reached me first). The other is by Le Verrier in the Comptes Rendus
of 1 June 1846, which and a previous number I strongly recommend
you to consult. both have arrived at the same result, viz. that
the present longitude of the said disturber must be somewhere near
325°
Airy to
LeVerrier 2pp RGO R O Greenwich 1846 June 26
Sir,
I have
read with very great interest the account of your investigations
on the probable place of a planet disturbing the motions of Uranus,
which is contained in the comptes Rendus de l'Academie of
June 1. And I now beg leave to trouble you with the following question:
it appears from all the later observations of Uranus made at Greenwich
which are not completely reduced in the "Greenwich Observations"
of each year, so as to exhibit the effect of an error either in
the Tabular Heliocentric longitude (or the Tabular Radius Vector)
that the Tabular Radius Vector is consistently too small. And I
wish to inquire of you whether this would be a consquence of the
disturbance produced by an exterior planet now in the position which
you have indicated?
I imagine
that it would not be so, because...
Airy to
Challis RGO
Deanery
Ely 1846 July 9 3pp
My dear
Sir,
You know
that I attach importance to the examination of that part of the
heavens in which there is a possible shadow of reason for suspecting
the existence of a planet exterior to Uranus. I have thought about
the way of making such examination, but I am convinced that (for
various reasons of declination, latitude, feebleness of light &
regularity of superintendance) there is no prospect whatever of
its being made with any chance of success except with the Northumberland
Telescope.
Now I
should be glad to ask you in the first place whether you could make
such an examination?
Presuming
that your answer would be in the negative, I would ask Secondly
whether supposing that an Assistant were supplied to you for this
purpose, you would superintend the examination?
You will
readily perceive that all this is in a most unformed state at present,
and that I am asking these questions almost at a venture in the
hope of rescuing the matter from a state which is, without the assistance
that you and your instruments can give, almost desperate.
Therefore
I should be glad to have your answer, not only responding simply
to my question, but also entering into any other considerations
which you think likely to hear on the matter.
Airy to
Challis 1846 July 13 RGO v. faded
My Dear
Sir,
... I
only add at present that in my opinion the importance of this inquiry
exceeds that of any current work which is of such a nature as not
to be totally lost by delay.
Challis
to Airy, July 18 4pp RGO copy McA 33:1
Cambridge
Observatory
(N.B.,
This letter reads as 1st time Challis had heard of the sky-search
proposal - it does not allude to earlier RGO Visitor's meeting)
My dear
Sir,
.... I
have determined on sweeping for this hypothetical planet...
Airy to
Challis RO Greenwich 2pp RGO 1846 July 21
My dear
Sir,
I am very
glad that you seriously think of looking for the possible planet...
I believe the Berlin maps may be obtained though Nutt 158 Fleet
Street or any German bookseller. There is only one which applies
partially to this inquiry.
The Times
THE NEW PLANET 1846 August 4 not RGONE
... M.Leverrier
perceived that there was no chance of attaining a staisfactory solution
except by resuming the theory of the new planet in all its elements...
It was only after this labour, as repulsive from the length of the
calculations as it was difficult from the invention of the methods,
that M.Leverrier was able to tell the Academy, "The irregularities
of Uranus are due to the action of a planet as yet unknown, which,
in January 1, 1847, will pass by the 325th degree of heliocentric
longitude."... Let us hope that the stars of which Clairaut speaks
[concerning an earlier return of Halley's comet] will not all remain
invisible, and that if chance discovered Uranus, we shall soon succeed
in seeing the planet whose position has been ascertained by M.Leverrier.
Adams to
Airy 2nd Sept. 6pp RGO St John's College
Sir,
In the
investigation, the results of which I communicated to you last October,
the mean distance of the supposed disturbing planet is assumed to
be twice that of Uranus. Some assumption is necessary in the first
instance, and Bode's law renders it probable that the above distance
is not very remote from the truth: but the investigation could scarcely
be considereed satisfactory while based on any thing arbitrary;
and I therefore determined to repeat the calculation, making a different
hypothesis as to the mean distance. The eccentricity also resulting
from my former calculations was far to large to be probable; and
I found that, although the agreement between theory and observation
continued very satisfactory down to 1840, the difference in subsequent
years was becoming very sensible, and I hoped that these errors,
as well as the eccentricity, might be diminished by taking a different
mean distance. Not to make too violent a change, I assumed this
distance to be less than the former value by 1/20th part of the
whole. The result is very satisfactory, and appears to shew that,
by still further diminishing the distance, the agreement between
the theory and the earlier observations may be rendered complete,
and the eccentricity reduced at the same time to a very small quantity.
The mass and the elements of the supposed planet, which result from
the two hypotheses, are as follows: -
Hypothesis
1. Hypothesis II.
a/a' =
0.5 a/a' = 0.515
Mean longitude
of Planet, 1st Oct. 1846 325° 8' 323° 2'
... By
comparing these errors, it may be inferred that the agreement of
theory and observation, would be rendered very close by assuming
a/a'=0.57, and the corresponding mean longitude on the 1st October,
1846, would be about 315° 20', which I am inclined to think
is not far from the truth... I have been thinking of drawing up
a brief account of my investigation to present to the British Association..
Hind to
Challis Sept 16 IoA
3, Allsop's
Terrace, New Road, London
Sir,
I have
received a letter this morning from M. Faye on the subject of Le
Verrier's planet, which I think may be of some service in the search.
I mentioned to him a few days since that I had heard you were employed
in observing stars with the view to its discovery and that I was
similarly occupied. I will give the extract from Mr Faye's letter
in his own words: ... Jusqu'ici je ne me suis pas livie a cette
recherche, nos instruments ne me paraissant pas assez puissante
pour cela.
LeVerrier
to Galle 1846 Sept 18 MNRAS, 1911, LXXI, pp278.
A Monsieur
J.G.Galle
Vous verrez,
Monsieur, que je demonstre qu'on ne peut satisfaire auz observations
d'Uranus qu'en introdusiant l'action d'une nouvelle Planete, jusqu'ici
inconnu; at ce qui est remarquable, il n'y a dans l'ecliptique qu'une
seule position qui puisse etre attribuee a cete Planete perturbatrice.
Voici les elements de l'orbite que j'assigne a cet astre.
(Elements,
for Jan 1, 1847, True Helio long)
La position
actuelle de cet astre montre que nous sommes actuellement, et que
nous serons encore, pendant plusieurs mois, dans las conditions
favourables pour le d_couvrir.
D'ailleurs,
la grandeur de sa masse permet de conclure que la grandeur de son
diametre apparent est de plus de 3" sexegesimales.
Galle to
Leverrier Berlin, le 25. Sept 1846
Monsieur,
La planète
dont vous avez signalé la position réelement existe.
Le même jour ou j'ai recu votre lettre, je trouvai une etoile
de 8me grandeur, qui n'etait pas inscrite dans l'excellente carte
Hora XXI (dessine par M. le Dr. Bremmiker) de la Collection de cartes
celestes publiee par l'Academie roy. de Berlin.
Schumacher
to LeVerrier Altona Sept 28
... je
ne peux pas resister au penchant de mon coeur, en vous transmettant
sans retard mes felicitations les plus sinceres sur votre brilliante
decouverte. C'est le plus noble triomphe de la theorie que je connaisse.
Hind to
Adams Sept 30 JCA 9:23
Understanding
from Prof. Challis that you are occupied about the planet of Le
Verrier, I think you will be gratified to learn that it was discovered
by Dr Galle at Berlin on Sept 23... What a grand discovery this
is, and how glorious a triumph for analysis!
LeVerrier
to Galle Paris, Octobre 1
...Le Bureau
des Longitudes s'est prononcee ici pour Neptune. Le signe un trident.
James Glaisher
Blackheath, Oct 1 not RGONE
to The
Illustrated London News p.230 Oct 10, The Editor
The circumstance
of the discovery of a new Planet at any time cannot fail to be highly
interesting, and must necessarily attract much attention. The discovery
of a Planet in the space assigned to it by theory must be highly
gratifying indeed... Le Verrier was the first to perform these calculations;
and on September 23rd, Dr Galle, at Berlin, received a letter from
him, requesting a search to be made for the then hypothetical Planet;
and, on the same evening, during a comparison of the heavens with
Dr Bremicker's map, he saw a star of the eight magnitude not marked
on the map, in the constellation of Aquarius, as marked in the annexed
Chart.
Challis
to Cambridge Chronicle Oct 1st
Sir, ...
The discovery of this planet is, perhaps, the greatest triumph of
astronical science that has ever been recorded. The merit is mainy
due to Theoretical Astronomy. About four months ago, Mr Adams, of
St. John's college, and M.Le Verrier, an eminent French mathematician,
concluded independently from theoretical calculations, that anomalies
which had long been known to exist in the motion of the planet Uranus,
could be accounted for by supposing a perturbing planet to move
in an orbit at twice the distance from the sun. These mathemasticians
agreed in fixing on 325° of heliocentric longitude as the most
probable positon of the suposed planet, which has proved to be very
little different from the actual position. Le Verrier more recently
inferred, from a most profound and elaborate investigation, that
the mass of the disturbing planet was to that of Uranus in the proportion
of 5 to 2, (a result which Mr.Adams also arrived at by continuing
his researches), and that it might consequently present a disc discernable
in powerful telescopes. He went to far as to recommend seeking to
detect it by its physical appearance rather than by the laborious
method of mapping stars, and marked out very narrow limits within
which the search should be made....
Having
been anticipated in the discovery of this planet, I need not detail
the efforts I made to find it. I may, however, be permitted to state
that for the last two months I have been engaged in mapping the
stars in the neighbourhood of the probable place, a method which,
though slow, must eventually have been successful. The last investigation
of Leverrier came to my knowledge on Sept 29. On the evening of
that day I observed strictly according to his suggestions, and out
of a vast number of stars which passed through the field of view
(power 160), I selected only one, against which I directed my assistant
to write, "seems to have a disc." This was the planet. Before I
had the opportunity of verifying my suspicion, the news of the discovery
reached me.
Herschel
to The Athenaeum 1846 Oct 1st
p.1019
No. 988 Oct 3rd
In my
address to the British Association assembled at Southampton, on
the occasion of my resigning the chair to Sir R. Murchison, I stated,
among the remarkable astronomical events of the last twelvemonth,
that it had added a new planet to our list, - adding, "it has done
more, - it has given us the probable prospect of the discovery of
another. We see it as Columbus saw America from the shores of Spain.
Its movements have been felt, trembling along the far-reaching line
of our analysis, with a certainty hardly inferior to occular demonstration."
- These expressions are not reported in any of the papers which
profess to give an account of the proceedings, but I appeal to all
present whether they were not used.
The remarkable
calculations of M.Leverrier - which have pointed out, as now appears,
nearly the true situation of the new planet, by resolving the inverse
problem of perturbations - if uncorroborated by repetition of the
numerical calculations by another hand, or by independent investigation
from another quarter, would hardly justify so strong an assurance
as that conveyed by my exprtessions above alluded to. But it was
known to me, at that time, (I will take the liberty to cite the
Astronomer-Royal as my authority) that a similar investigation had
been independently entered into, and a conclusion as to the situation
of the new planet very nearly coincident with M.Le Verrier's arrived
at (in entire ignorance of his conclusions), by a young Cambridge
mathematician, Mr Adams;- who will, I hope, pardon this mention
of his name (the matter being one of great historical moment), -
and who will, doubtless, in his own good time and manner, place
his calculations before the public.
Challis
to Arago, Cambridge Oct 5
(this
letter only exists in French translation, Comptes Rendus 12th October
1846 p.715)
Je n'avais
pas encore pousse le travail jusqu'a la position actuelle de la
planete, lorsque j'eus connaissance, le 29 septembre, par le no
662 du journal l'Institut, des resultats des dernieres recherches
de M. Le Verrier. Je ,me conformai strictemet aux suggestions de
cet astronome, at je me renfermai dans les limites qu'il avait indiquees.
John Stevelly
to Herschel Belfast
8th October
1846
I have
read with much interest your letter to The Athenaeum, and feel I
think as warmly as I should on the announcement of the discovery
of the new Planet which succeeded it. In my opinion your simple
averment that you had used at Southampton the very remarkable words
which you quote would have been quite sufficient to satisfy any
person interested in these matters that you had used them; but as
you have deemed it proper to appeal to those present on the occasion,
I have no hesitation in saying that I remember the words most distinctly.
I am much surprised that they were not reported for they fastened
themselves more upon my imagination, and afforded me more matter
for mental speculation then almost any other sentence you had uttered:
but I was totally ignorant of the history which has now come out.
I supposed that analysis was leading to the conviction that another
asteroid of the Astraea class must exist and might soon be discovered.
Challis
to Airy
Cambridge
Observatory Oct. 12. 1846
My dear
Sir,
.. I commenced
observing on July 29, attacking first of all, as it was prudent
to do, the position which Mr Adams' calculations assigned as the
most probable place of the planet. .. In this way I took all the
stars to the 11th magnitude in a zone 9' in breadth... The space
gone over on August 12 exceeded in length that of July 30, but included
the whole of it. on comparing the observations of these two days,
I found that the zone of July 30 contained every star in
the corresponding position of the zone of Aug.12, except one
star of the 8th magnitude. This, according to the principle
of search, which in the want of a good star-map I had adopted, must
have been a Planet. It had wandered into the latter zone in the
interval between July 30 & Aug. 12. By this statement you will
see that after four days of observing the Planet was in my grasp
if only I had examined or mapped the observations. I delayed doing
this partly because I thought the probability of discovery was very
small till a much larger portion of the heavens were scrutinised...
Airy to
Herschel McA 33:2 RGO 7/247 f16-17
Royal
Observatory, Greenwich 1846 Oct 13
My dear
Sir,
...Before
leaving Germany, I had pretty well determined to write an account
of the English transactions relating to this planet (always supposing
that Mr Adams and Professor Challis do not object to my publishing
their letters) and to present it to the R. Astronomical Society.
First, it ought to be done, because it will be an interesting history
and well illustrative of the present state of science. Secondly,
I can do it better than anybody else, because my position enabled
me to know generally some points of the progress in both the theoretical
and the observing directions, while I myself did nothing at all
in either.
Airy to
Adams 1846 Oct 14 JCA 2:2
Dear Sir
In reference
to this, it appears to me proper that I should write a commentary
to the R.Astronomical Society an account of what I know of the English
transaction thereto relating. My reasons as I have already explained
to Professor Challis, are - 1st. That it is illustrative of the
history of science, 2nd. That it would do justice to England. -
3rd that it would do justice to individuals - 4th. I could
do it because I know nearly all the history and yet have taken no
part in the theory or the observation.
Airy to
LeVerrier McA 33:3
Royal
Observatory, Greenwich, 1846. Oct 14.
May you
enjoy the honours which await you! and may you undertake other works
with the same skill and the same success, and receive from all,
the enjoyment which you merit!
I do not
know whether you are aware that collateral researches had been going
on in England, and that they had led to precisely the same result
as yours. I think it probable that I shall be called upon to give
an account of these. If in this I shall give praise to others I
beg that you will not consider it as at all interfering with my
acknowledgement of your claims. You are to be recognised, beyond
doubt, as the real predictor of the planet's place. I may add that
the english investigations, as I believe, were not quite so extensive
as yours. They were known to me earlier than yours.
There is
one thing which somewhat disturbs my mythological ideas, namely
the name Neptune, which (it is understood) you propose to fix upon
the planet. There seems to be an interruption of order which is
unpleasant. If you would consent to adopt the name Oceanus instead,
it would, I think, be better received, as more similar in its character
to that of its predecessor, Uranus, and more closely related to
the mythological ideas of the Greeks.
The Guardian
(London) Oct 14 LE VERRIER'S PLANET No.25, p.389
The last
month has witnessed one of the most remarkable triumphs of modern
science ... The credit of this brilliant discovery belongs to a
French Astronomer, M. LE VERRIER, and we earnestly hope that no
attempt will be made to diminish his well-won honour ... it was
reserved for M. LE VERRIER to venture to make an unknown planet
the subject of a rigorous mathematical problem, and on mathematical
grounds alone, and with mathematical exactness, to anticipate and
guide the observer. Calculations of the same nature may have been
engaging the simultaneous attention of other mathematicians,* but
M.LE VERRIER's claim to the honour of this achievement must always
be paramount, because he first had such confidence in his theory,
as to announce it publicly, without qualification, and in the minutest
expression, and to stake his credit on its verification.
..................................
* Sir J.Herschel's
Letter to the Athenaeum, given in the Guardian of last week.
Adams to
Airy McA 33:3
Cambridge
Oct 15th 1846
...Professor
Challis has, I believe, communicated to you the remarkable fact
that he observed the planet so long ago as August 4th, and again
on August 12th, the first date being only a few days after he commenced
the search for it. I have been founding some calculations on the
comparison of these with the recent observations & although
the interval is far too small for the determination of elliptic
elements, I have ascertained that the distance of the planet from
the Sun at present is not far from 30.05 which is considerably less
than the value given by M. le Verrier. In my letter of Septr. 2nd
I inferred that the mean distance used in my first hypothesis must
be greatly diminished, but I rather hastily concluded that the change
in the mean Long. deduced would be nearly proportional to the change
in the assumed mean distance.
Challis
to Athenaeum Cambridge Oct 15th
No 990
p.1069, Oct 17
The allusion
made by Sir John Herschel in his letter contained in the Athenaeum
of October 3rd, to the theoretical researches of Mr Adams, respecting
the newly-discovered planet, has induced me to request that you
would make the following communication public. ... In September,
1845, Mr Adams communicated to me values which he had obtained for
the heliocentric longitude, excentricity of orbit, longitude of
perihelion, and mass, of an assumed exterior planet, - deduced entirely
from unaccounted-for perturbations of Uranus. The same results,
somewhat corrected, he communicated, in October, to the Astronomer-Royal.
M.Le Verrier, in an investigation which was published in June of
1846, assigned very nearly the same heliocentric longitude for the
probable position of the planet as Mr Adams had arrived at, but
gave no results respecting its mass and the form of its orbit...
I undertook to make the search,- and commenced observing on July
29. The observations were directed, in the first instance, to the
part of the heavens which theory had pointed out as the most probable
place opf the planet; in selecting which I was guided by a paper
drawn up for me by Mr. Adams. Not having hour XXI of the Berlin
star-maps - of the publication of which I weas not aware - I had
to proceed on the principle of comparison of observations made at
intervals. On July 30, I went over a zone 9' broad, in such a manner
as to include all stars of the eleventh magnitude. On August 4,
I took a broader zone,- and recorded a place of the planet. My next
observations were on August 12; when I met with a star of the eighth
magnitude in the zone which I had gone over on July 30,- and which
did not then contain this star. Of course, this was the planet;-
the place of which was, thus, recorded a second time in four days
of observing. A comparison of the observations of July 30 and August
12 would, according to the principle of search which I employed,
have shown me the planet. I did not make the comparison till after
the detection of it at Berlin - partly because I had an impression
that a much more extensive search was required to give any probability
of discovery- and partly from the press of other occupation. The
planet, however, was secured, and two positions of it recorded six
weeks earlier here than in any other observatory, - and in a systematic
search expressly undertaken for the purpose. I give now the positions
of the planet on august 4 and August 12.
(R.A.,
N.P.D. positions)
From these
places compared with recent observations Mr Adams has obtained the
following results:-
Distance
of the planet from the sun... 30.05
Inclination
of the orbit ........ 1° 45'
Longitude
of the descending node .....309° 43'
Geocentric
longitude, Aug 4. ..... 326° 39'
The present
distance from the sun is, therefore, thirty times the earth's mean
distance;- which is somewhat less than the theory had indicated.
The other elements of the orbit cannot be approximated to till the
observations shall have been continued for a longer period.
The part
taken by Mr. Adams in the theoretical search after this planet will,
perhaps, be considered to justify the suggesting of a name. With
his consent, I mention Oceanus as one which may possibly
receive the votes of astronomers.- I have authority to state that
Mr Adams's investigations will, in a short time, be published in
detail.
McA
33:4
Leverrier
to Airy 4pp RGO Paris, le 16 Octobre 1846
Monsieur
et illustre Confrere,
Pourquoi
Mr Adams aurait-il garde le silence depuis quatre mois? Pourquoi
n'aurait-il pas parle des les mois de Juin, s'il eut eu de bones
raisons a donner? Poirquoi attend-on que l'astre ait ete vu dans
les lunettes?
Translation:
Why would Mr Adams have kept silent for four months? Why would he
not have spoken from the month of June (onwards) if he had had good
reasons to give? Why wait until the object has been seen in the
telescope?... Is it enough to have undertaken researches on a subject
in order to claim to share the result? In that case Mr Adams and
I will find many competitors in France who will take precedence
by much in date.
Challis
to Cambridge Chronicle Oct 16
Sir - As
the discovery of a new planet is justly regarded as a matter of
great scientific interest, I am desirous of correcting an inaccurate
statement contained in my letter on the subject in the chronicle
of October 3. Writing in haste, without consulting memoranda, and
not having an oportunity of communicating with Mr Adams, I said
incorrectly that Mr Adams and M.Le Verrier, about four months ago,
determined theoretically the probable heliocentric longitude of
the planet. The fact is, that in September last year Mr Adams communicated
to me, and in the following month to the Astronomer Royal, values
which he had obtained not only of the heliocentric longitude, but
also of the mass, longiude of perihelion, and eccentricity of the
orbit of the supposed planet.
Airy to
LeVerrier 4pp. McA 33:5
Royal Observatory,
Greenwich 1846 October 19
Dear Sir,
A considerable
time ago, probably in the year 1844 or in the beginning of 1845
{I have not had leisure since my return to refer to my papers} I
supplied Mr Adams with several places of Uranus, expressly for an
investigation into the cause of its disturbance. In October or November
1845 I received from Mr Adams a notification that the disturbances
could be explained by supposing another planet to exist, of which
he gave me the elements.
Shortly
after this I addressed to him the same inquiry which I afterwards
addressed to you, namely whether the error of radius vector was
explained by the same disturbing planet. I know not whether any
accident prevented Mr Adams from receiving my letter: at any rate,
he gave me no answer. Had he answered me, I should have urged him
immediately to publish his investigations.
In June
1846 the numero of the Comptes Rendus containing your investigations
was received by me: I was astonished and delighted to find that
the elements were nearly the same and the present apparent place
of the disturbing planet nearly the same as those given by Mr Adams'
investigations.
On June
29th a meeting of the Board of Visitors of the Royal Observatory
was held at which Sir J.Herschel and Professor Challis were present.
At this meeting there was question about the expediency of distributing
subjects of observations among the different observatories, and
I strongly urged the importance of such distribution in some cases,
and I specially stated the probability of now finding the disturbing
planet if one observatory could be devoted to the search for it.
I gave as my reason the very strong evidence afforded by the agreement
of the result of your researches and Mr Adams' researches. It was
my strong statement upon this that induced Sir John Herschel so
to express himself at the meeting of the British Association and
to write such a letter to the Athenaeum. It was my statement also
which (followed by some correspondence) induced Professor Challis
to search for the planet. Professor Challis commenced his search
on July 29th, and saw the planet first on August 4, and subsequently
on August 12. All the rest of the history is known to you. I am
confident that you will now see that sir John Herschel was justified
in every expression which he has used.
But, my
dear Sir, you express yourself surprised that any one should suppose
that the results of mathematical investigations required confirmation.
If any person had reason to complain of this, it would be Mr Adams:
for we waited until Mr Adams' results were confirmed by yours, and
not until yours were confirmed by Mr Adams.
LeVerrier
to Airy, 2pp RGO McA 33:5
Paris,
le 19 Octobre 1846
Monsieur
et illustre confere,
Vous aurez
sans-doute ete surpris de m'entendre declarer que j'avais entre
les mains une lettre de Mr Challis, etablissant que cet astronome
avait cherche la planete d'apres mon travail. Comment le concilier
avec la lettre qu'il a publiee dans l'Athenaeum?
... Il
m'etait impossible de deviner que pendant que Mr Challis disait
blanc en France, il disait noir en angleterre.
Royal
Observatory, Greenwich 1846 October 21
Airy to
LeVerrier McA 33:6
Of one
thing, however, I am sure you may make yourself quite certain, -
that no person in England will dispute the completeness of your
investigations, the sagacity of your remarks on the points it was
important to observe, and the firmness of your moral convictions
as to the accuracy and certainty of the results. With these things,
the product not only of a mathematical but also of a philosophical
mind, we have nothing which we can put in competition. My acknowledgement
of this will never be wanting; nor, I am confident, will that of
any other Englishman who really knows the history of the matter.
LE NATIONAL
of 21 October
ACADEMIE
DES SCIENCES
Seance
du 19 octobre
LE VOL
A LA PLANETE
...Le fait
est que les trois premiers astronomes de la Grand-Bretagne ont organise
a loisir un miserable com-plot pour voler la decouverte do M. LeVerrier.
Ce sont M.John Herschel (le fils de celui dont M. Arago a fait connaitre
la gloire a toute l'Europe), M. Airy, directeur de l'observatoire
de greenwich, at M.Challis, directeur de l'Observatoire de Cambridge
qui ... ont fait le coup! (It cites 3 dates, June 1st &
Aug 31 of Lev's papers, then Sept 23rd the discovery, then continues:)
A cette
epoque, que faisait les astronomes anglais? Aucune publication officielle,
aucune confidence aux journaux, aucun de ces bruits qui accompagnent
les recherches scientifiques n'avaient permis de soupconner qu'on
s'occupait du meme sujet en Angleterre. Bien mieux, M.Airy, de Greenwich,
et M.Challis, de Cambridge (deux de nos trois culpables) annoncaient
positivement dans les lettres suivantes qu'ils n'auraient jamais
rien a revendiquer dans la decouverte de notre compatriote.
Voici
ce qu'ecriverait M.Airy a M.Leverrier, le 26 Juin (reproduces Airy's
letter to LeVerrier of June 26)
Ainsi,
le 26 Juin 1846, non-seulement M.Airy ne possedait pas des calculs
anglais semblables de M.Leverrier, mais il relevait dans les calculs
de notre compatriote des circonstances incompatibles avec la position
assignee a sa planete encore hypothetique: "Le desordre observe
dans la marche d'Uranus, dit-il expressement, est-il produit par
une planete situee a la place ou vous la-mettez? JE NE CROIS PAS
QU'IL EN SOIT AINSI" Et il montre pourquoi....
[NB, this
isn't an entirely fair comment upon Airy's letter, which was inquiring
upon the radius vector, N.K.]
Arago to
Airy Oct 23 McA 33:6
Conseil
General Municipal, Dept de la Siene, Ville de Paris
Mon cher
et illustre confere,
L'academie
s'est occupee, lundi dernier, de la reclamation de priorite que
vous, Mr Herschel et Mr Challis avez cru devoir soulever en faveur
de Mr Adams.
J'ai porte
la parole dans ce debat. En combattant des idees que je ne crois
point justes, je n'ai pas oublie qu'elles etaient presentees et
apuyees par des hommes d'un grand talent et du plus noble charactere.
Un journaliste a rendu compte de notre seance, en des termes qui
ont excite ma plu vive indignation. Ce sentiment a ete partage par
touts les amis eclaires des sciences. J'avais besoin de vous en
donner l'assurance.
Airy to
Arago McA 33:7
Royal
Observatory, Greenwich 1846 October, 26
My Dear
Sir,
With very
great pleasure I yesterday received your letter of the 23rd, disclaiming
the articles relating to the New Planet in The National of Oct 21.
It was impossible for any one, who is personally acquainted with
yourself or with other men of science in France, to suppose that
the discreditable article, to which I allude, could have your sanction:
but I am very glad that you have put it in my power formally to
announce this to the British public. I, and every other Englishman,
recognise fully the right of French savans to urge or to support
the claims of French discoverors, and we are quite certain that
these claims will be asserted, within the French academy, in a dignified
and courteous tone. In like manner we claim for ourselves the right
of explaining what our countrymen and friends have done, conceiving
it also to be our duty to express ourselves in courteous language.
I am proud to say that no paper published in England, which I have
yet seen, has transgressed this rule. I write to M Le Verrier to-day,
and (as I gather from M. Le Verrier's letters that you are entirely
in his confidence) I will state to you two points which I have urged
on him.
The first
is - that I have not published a word of any kind or in any manner
relating to the New Planet; and that I have not written a word to
any person in France excep to M.Le Verrier himself: and that my
letters to him were intended to be most friendly. Under these circumstances,
it is a matter of great surprise to me that these letters should
be produced in public in such a way that I should become the subject
of public abuse in France. It appears that copies of my letters
have been supplied in some manner to the National newspaper.
This transaction is entirely opposed to our English ideas of propriety:
I cannot conceive it to be quite right. There is one thing which
M. Le Verrier, as a man of honour, is now bound to do. In my letters
of October 19 and October 21 I have given, I believe, the whole
history of the English part of this affair: and, I think, in such
a manner as to remove much of the misunderstanding which has prevailed.
I think that M.Le Verrier is bound to place these letters in your
hands.
The second
is that M.Le Verrier is under some total misapprehension as to the
conduct of Professor Challis. There is not in the whole world a
man more scrupulously just than Professor Challis. You will learn
from my letters (to which I have alluded) what was his course of
observation. At my instigation, which was founded upon the confirmation
of Mr Adams' results (long before known to us) by M.Le Verrier's
results. Professor Challis began observations in July, referring
generally to Mr Adams for the planet's place, but sweeping a very
large zone.
On Sept.
29 he received M. Le Verrier's second paper, and was so much struck
with the sagacity of the considerations and the force with which
they were presented that he immediately restricted his observations
to a much smaller zone. In this there is none of the inconsistence
(sic) which M.Le Verrier in his letters, and the National
in its scurrilous article ascribe to Professor Challis. And
there is no inconsistence in his two statements of them.
<hr>Airy
to The Athenaeum R O Greenwich Oct 26
p.118,
No. 992, Oct 31
In the
National French newspaper of the 21st instant there is a most
virulent article on the subject of the New Planet; containing a
report of the meeting of the French Academy on the 19th (in which
the priority of predictions of the planet was discussed), and loading
Sir John Herschel, Professor Challis, and myself with grossest abuse...
Herschel
to The Guardian (London) Collingwood Oct 28 1846
No. 27,
p.421
Sir, -
I deeply regret that Mr Le Verrier should have found cause of complaint
or offence in my communication to the Athenaeum. nothing was ever
further from my intention than to detract from the glory of his
noble discovery, or tear one leaf from the wreath which he has so
honourably won. The prize is his by all the rules of fair adjudication,
and there is not a man in England who will grudge him its possession.
I do not
wish here to repeat the offence of which M LeVerrier conceives I
have been guilty, but I must say a few words in explanation of my
motives. The history of this grand discovery is that of thought
in one of its highest manifestations, of science in one of its most
refined applications. So viewed, it offers a deeper interest than
any personal question. In proportion to the importance of this step,
it is surely interesting to know that more than one mathematician
has been found capable of taking it. The fact, thus stated, becomes,
so to speak, a measure of the maturity of our science; nor can I
conceive anything better calculated to impress the general mind
with a respect for the mass of accumulated facts, laws, and methods,
as they exist at present, and the reality and efficiency of the
forms into which they have been moulded, than such a circumstance.
We need some reminder of this kind in England, where a want of faith
in the higher theories is still to a certain degree our besetting
weakness.
Schumacher
to Airy (trans, copied excerpt?) Date?
I scarcely
know what I shall say about Mr Challis. He sees the great probability
that the predicted planet must exist by the near coincidence of
its place, which two, totally indepencent Calculators assign. You
request sweeps with the Northumberland Equatorial from him. He makes
such sweeps July 30, Aug. 4, and Aug 12, but lays them aside, without
looking at them. Now such observations are only made in order to
compare them one with the other, and to see if a star has changed
its relative place to the others. First when he hears that the new
planet has been observed Sep 23 at Berlin, he examines his observations
made nearly two months before...
Augustus
de Morgan Editorial in The Athenaeum not RGONE
1846 Oct
31 p.1117, No 992
THE NEW
PLANET AND THE FRENCH ASTRONOMERS
Our neighbours,
the French - or at least some of the journalists and some of the
members of the Institute - are in a great state of excitement about
what they consider as the attempt to deprive their countryman, Leverrier,
of the honour of his new planet. They may rest easy;- no power on
earth can deprive him of an immortal name amongst astronomers...
The facts
at this moment are simple;- and out of their simplicity arises what
may be, or may not, be a difficult issue to try. M.Leverrier has
calculated - has predicted- and has had his prediction verified.
He has also been the first to make a perfect public announcement,
complete in itself. But Mr Adams also calculated; and furnished
Mr Challis with the means of actually securing two observations
of the planet previous to any such announcement by M. Leverrier...
Mr Adams'
claim, whatever it might be, should not be lost by an early statement
of the facts upon proof of which it is to rest.
Challis
to Airy McA 33:8
Nov 3
1846
Cambridge
Observatory
Nov 3
1846
Wartmann's
star, which they have been talking about in the French Academy,
Adams considered long since, and ascertained that if the observations
are at all approximate, it must be much nearer the Sun than the
new Planet.
I am sorry
to say I can give no hopes of Adams's being able to undertake the
Astronomical Report. He is moderator this year, and this, with his
college duties, takes his time. I am in difficulty about this Report,
& should be glad to see some means of getting out of it.
From Herschel
to W.Whewell Nov 6 1846 RS HS 22:256
I mourn
over the loss to England and to Cambridge of a discovery which ought
to have been theirs every inch of it, but I have said enough about
it to get heartily abused in France, and I don't want to get hated
in England for saying more.
J.R.Hind
to Rev. R. Sheepshanks RAS McA 34:15 1846 Nov 12
Dear Sir,
I am quite
willing to allow Mr Adams all the merit he deserves for the investigations
made by him, but I cannot admit that he is entitled to any share
whatever in the discovery itself. Nor do I see how Mr Challis can
lay claim to any credit in the discovery as it is very evident he
did not place much dependence on his obsns. or he should have found
the planet in August last. It is very well for the Cambridge people
to do the best for their own men. I am sure you must have noticed
the inexcusable secrecy observed by all those acquainted with Mr
Adams results: it is this secrecy which I hold to deprive Mr A.
of all share in the discovery and I am very glad to find, that I
am not the only one who thinks so. Moreover it appears to me very
intrusive in the Cambridge people to urge a name for the
planet on Astronomers, and one too which is no more likely to succeed
with the French (who have the only right to name it) than if it
had been dubbed "Wellington"
Adams to
Airy, McA 33:8 St John's Coll.
18th Nov.
1846
…. For
several years past, the observed place of Uranus has been falling
rapidly more and more behind its Tabular place. In other words,
the real angular motion of Uranus is considerably slower
than that given by the Tables. This appeared to me to show clearly
that the Tabular Radius Vector would be considerably increased by
any theory which represented the motion in Longitude, for the variation
in the second member of the eqn.
r2.dΘ/dt
= Ö (μα(1-e2) is very small.
Accordingly,
I found that if I simply corrected the elliptic elements, so as
to satisfy the modern observations as nearly as possible, without
taking into account any additional perturbations, the corresponding
increase in the Radius Vector would not be very different from that
given by my actual Theory. Hence it was that I was led to defer
writing to you till I could find time to draw up an account of the
method employed to obtain the results which I had communicated to
you.
P.S. -
I drew up a paper for the meeting of the British Association at
Southampton, but did not arrive there in sufficient time to present
it, as section A closed its sittings one day earlier than I expected.
Sheepshanks
to Challis Nov 20 Reading IoA not RGONE
I have
been struck with the sort of fatality, which has burned us
to the very heart [pursued us the very heart ??]. The most
prudent precautions & best schemed places of observation have
failed from causes which no-one could forsee and which few will
now allow for.
Adams to
Whewell JCA 38:20 not RGONE
St John's
College 24th nov. 1846
Dear Sir,
It is quite
true that I conceived the idea of trying to account for the anomalies
in the motion of Uranus by the action of another planet in 1841.
My attention was directed to the subject by reading Mr Airy's valuable
Report on the Recent progress of Astronomy, in which the fact of
the existence of these anomalies is put prominently forward. On
considering the subject, it appeared to me that by far the most
probable hypothesis that could be formed to account for these irregularities
was that of the existence of an exterior undiscovered planet. None
of the other hypotheses that had been thrown out, appeared to possess
the slightest claims of attention, being very improbable in themselves
& incapable of being tested to any great calculation.
The first
mentioned hypothesis on the contrary, appeared to be thoroughly
in accordance with the present state of our knowledge & promised
to lead to an approximate determination of the position of the disturbing
body. The following is a copy of a memorandum on this subject preserved
among my papers, which may be interesting to you.
"1841
July 3. formed a design in the beginning of this work of investigating
as soon as possible after taking my degree, the irregularities in
the motion of Uranus which are yet unaccounted for, in order to
find whether they may be attributed to the action of an undiscovered
planet beyond it; & if possible, thence to determine approximately
the elements of its orbit Etc. which would probably lead to its
discovery."
Accordingly
in 1843 I commenced my calculations & in the course of that
year, I arrived at a first solution of that problem, which, though
incomplete in itself, fully convinced me that the hypothesis which
I had formed was quite adequate to account for the observed irregularities,
& that the place of the disturbing body might be very approximately
determined by a more extended investigation.
RS:HS14.364
Translation Arago to Herschel
Paris
22nd November 1846
My
dear colleague and friend
I
was eager to show the letter you sent me, which was so loyal and
so agreeable, to Mr LeVerrier. He was charmed by it. Your feelings
towards him gave birth to a thought which I hope you will welcome
with kindness: my young friend will beg you to represent him on
the day when the Royal Society awards him the Copley Medal. The
misunderstanding of a few weeks ago could not be resolved more happily.
I
can see the time when I reprint my analysis of the works of your
illustrious father, rapidly approaching. Have the goodness to point
out the errors that I may have committed so that I can correct them.
I would also like to know if there is a portrait of your father
in existence, in which the resemblance is incontestable. I would
have it reduced by one of our best artists and I would place it
at the head of my account, to the great satisfaction of the French
Public.
PS
I hope that you will find nothing amiss with the way in which I
spoke of you in the last but one report of the Academy of Sciences.
RS:HS11.195
Translation
Leverrier
to Herschel Paris 22nd March 1846
Sir
and Eminent colleague
Mr
Arago has shown me the letter which you wrote to him recently and
in which you announced that the Royal Society had awarded me the
Copley Medal.
I
am particularly happy that this decision was taken at your request
and to bear witness to the value that I attach to such an honourable
step for me, I ask your leave to make a fitting response to your
compliment by begging you to be my representative and to express
my gratitude at the meeting which will be so glorious for me, on
the 30th November.
Please
accept Sir and eminent colleague, my deep and respectful homage.
U
J Leverrier
To
Mr Herschel
Sedgwick
to Airy McA 33:9
Cambridge Dec 3 1846
My
dear Airy,
I write in a great hurry (almost on my way to my lecture room) in
consequence of a conversation at Pembroke lodge reported to me in
our Combination Room yesterday evening. I was too stupid & sleepy
to write last night. You were accused not only of unreasonable incredulity
& apathy towards Adams of St John, but also of having (as was
said) "snubbed him from the first," & so acting on a timid person,
prevented him from reaping the honours of a great discovery. This
kind of charge I heard before, repeated in public by two M.A's of
St Johns about three weeks since, when you & Challis were both
blamed, but you more than Challis. The most specific charge in proof
of what was called "snubbing" was this, viz., that Adams communicated
certain important results when you were away - so far of course
no blame in the case - but after your return, that Adams
called again, when you were at home; & that you refused to give
him an audience. This is to me quite incredible, & I hope you
will enable me to meet it by a point blank contradiction.
Pray do so by return of post if you can, I have no doubt some fact
is here either invented or distorted. -
As to apathy & incredulity misapplied I think the facts speak
so loudly that my dull ears cannot help hearing them. Your own statement
is clearly & honestly written & certainly is not written
in the spirit of self-praise. Had the results communicated to you
& Challis been sent to Berlin, I am told, they came so near
the mark, that to a certainty the new planet would have been
made out in a very few weeks, perhaps a very few days, & the
whole business settled in 1845 - Adams the sole, unadvised, unassisted,
discoveror. Is this so? Do Adams' results come so near the mark
as to justify such language? If so, I must myself chime in with
the pack of grumblers. To say the very least of it, a grand occasion
has been thrown away. The timidity of Adams was truly astonishing.
I think I know you too well, & I value your friendship too much
to think you will be angry with me for writing as I am doing. -
But stop a moment! There is one point more I had forgotten - When
about June last Le Verrier published one of the results Adams
had obtained before (Septr. 1845) Why, in the name of wonder,
was not all Europe made to ring with the fact thast a B.A. of Cambridge
had done all this (& more than this) ten months previously?
Now was, surely, the time to secure priority.
Airy
to Sedgwick McA 34:17
R O Greenwich 1846 Dec 4
Dear
Sedgwick,
I will answer your letter as explicitly as I can in the short time
I have to spare.
Charge
1. - Of "(some word that I cannot read)" and "apathy" towards Adams,
& of having "snubbed" him.
As
touching apathy, look at my letter of Nov 5, 1845, and see
whether it looks like apathy.
as
touching snubbing, I never had any opportunity of doing so.
My whole epistolatory communication with Adams is printed in the
"Account"; & I never saw him but twice, once somewhere with
Challis (I totally forget where), and once when Hansen and I came
for half a day to Cambridge & we were walking over St. John's
bridge. The interview on each occasion might last 2 minutes. No
other opportunity of seeing him.
...Charge
2. "That Adams called when I was at home, and that I refused to
give him an audience".
Untrue.
Charge
4. "Adams is a very young man - & he had no backer to urge him
on, & he says I did my best in sending my results to
two national observatories".
I am quite certain that no person can read my letter of November
5 1845 without seeing that I took very great interest in what Adams
was about, & that I entered so far into it as to ask for fuller
& more critical information. Adams, by not answering my letter,
not only left the matter in an unsatisfactory state, and thereby
"did not do his best in about sending results", but also
entirely stopped me from writing again.
Charge
5. "When about June last Le Verrier published one of the results
Adams had obtained before (Sept. 1845), why, in the name of wonder,
was not all Europe made to ring with the fact that a B.A. of Cambridge
had done this ten months previously?"
In the name of wonder what had I to do with this publication?
No understood rule of society would have justified me in doing so.
The first person to publish was Adams. The second
was Challis. The third was I. But there was a very serious
difficulty in the way of my doing so, because Adams had declined
to answer my letter. Moreover, in consequence of my question not
having been resolved, I had not till I received Le verrier's explanatory
letter the security for the truth of the theory which I desired.
I shall wipe my bloody nose quietly at home.
Yours most truly,
G.B.Airy
Capt
W.W. Smyth to G.B.Airy 5 December 1846
I don't quite like this proposed change in the nomenclature of the
Planets, for mythology is neutral ground. Herschel is a good name
enough. Le Verrier somehow or other suggests the idea of a Fabriquant
& is therefore not so good. But just think how awkward it would
be if the next planet should be discovered by a German: by a Bugge,
a Funk, or your hirsuite friend Boguslawski!
Augustus
de Morgan Editorial, The Athenaeum 1846 Dec 5th
p.1245-6,6
…It was a mere question of luck at the last; and if the Cambridge
library had possessed the twenty-first hour of the Berlin star-maps,
Adams and LeVerrier would have changed places....
We have just seen the Comptes Rendus of the 5th and 19th
of October. In the first, M. Arago pledges himself, whatever may
happen, not to call the new body by and name except the planet
Leverrier. In the second, without waiting for Mr Airy's explanation,
he decides that Mr Adams is not entitled to the slightest allusion
in the history of the discovery... [Arago's] distorting mirror of
national bias .. his mania...
Sedgwick
to Mrs Airy McA 33:10
Sunday Evening, Dec 6. 1846
My
dear Mrs Airy,
Many thanks for your kind letter...Adams, tho' a great philosopher
in his way, has shown no worldly wisdom - indeed has acted like
a bashful boy rather than like a man who has made a great discovery
-
The main facts (as stated by Adams) are as follows (1) He called
at the Observatory soon after his calculations were finished - the
Astronomer Royal away - Bad luck but no blame anywhere - this was
sept 1835 [sic] - (2) called again (Octr. the same Autumn) &
the Astronomer out - Left his card - heard that Airy would return
soon, & therefore left word that he would call again
- (3) Did call again (I think in a little more than an hour) &
was told that the Astronomer was at dinner; had no message; &
therefore went away. But he added that he did not call by
appointment - He only took his chance on his way back from
Devonshire to Cambridge, etc. etc. - I collected that he had been
mortified (I am not using his own words) at receiving no message
on the second call in October.
"I
thought," (said he) "that though he had been at dinner he would
have sent me a message, or perhaps spoken a word or two to me: but
I am now convinced that in fact he never knew of my second call"
- that the servant had not delivered my message with my card." -
... But he added "I did think that the Astronomer Royal would have
communicated my results among his correspondents - I took all that
for granted, & I thought it a publication" etc. etc
Airy’s
Dec 8th letter to Sedgwick: see section, ‘Airy blows
his top’
W.Airy
to Airy
Keysoe. 9 Dec. 1846
Dear
George,
When I was at Cambridge last week I heard so much about the new
planet that I actually went to bed and dreamed about it. You are
aware, I know, that the Johnians have taken up the cudgels against
you for 'snubbing' Adams, but I think whern Sedgwick wrote to you
(unless he has written a second time) he had not heard the specific
charge viz, "that you had appointed to see Adams some day before
2 o'clock; and when he called at 1/2 past one you were denied to
him."
Segdwick to Airy McA 33:10
Cambridge Wednesday Dec 9. 1846
In regard to the latter & ludicrous statement of your letter.
I must allow that Adams has shown little worldly wisdom, and acted
like a very simpleton - I never spoke to him till lately, after
this discussion was on the table [sic], & I ran some risk of
offending him by more than one thing I said to him.... Don't blame
Adams, & and above all don't blame me, for rash & foolish
words spoken by others. I love you & your family so much, &
so highly respect & honour you, that I should think it the greatest
misfortune of my life were you to entertain a single unkind thought
respecting me -
Airy
to Sedgwick McA 34:17
Flamsteed House - Greenwich 1846 Dec 10
Dear
Sedgwick,
I shall disobey the first command of your letter, because I am fully
as anxious to stand right with you as you with me. Now first "I
doubt not the facts of Adams' call were as you & Adams have
made out". You will observe that I made out I do not
mean concocted, but I do mean ascertained by investigation,
with the assistance of rational conjecture to fill up gaps....
I blame and blame severely those who have driven you into such a
corner. They have by their low conduct produced such a train of
circumstances that you have been compelled to ask questions
which no gentleman if free would ask and which no gentleman could
be expected to answer. Receive my assurances that I am and was perfectly
satisfied with what you have done - and that quite independently
of the result to which it has led: But never let me see the low
fellows who have caused it.
The
Liverpool and Lancashire General Advertiser (weekly)
Friday
Dec 11 1846
Astronomy, the New Planet by John Taylor
...M.Le
Verrier is the man who has done the work, and to him the honour
is due.
LE
VERRIER first his learned eye upraised,
And
on the problem with fixed purpose gazed:
No
inward fears subdued his generous soul;
No
dread of censure could his mind control;
The
fame of others his bold spirit fired,
And
with the hope to emulate inspired.
He
passed the barriers of those distant bounds,
Once
thought to mark the planet's lonely rounds,
Tracing
each wanderer in its varying course,
To
each assigning its attractive force;
Planting
the flag of Science wide unfurled
Upon
the flaming ramparts of the world;
And
traversing the Spheres by mental toil,
returns
victorious with his well-earned toil.
The laborious calculations made by LeVerrier on the secular inequalities
of the elements of the orbits, of the seven principal planets before
known, had prepared him for the task of ascertaining whether there
really were an unknown planet revolving in the orbit laid down for
it, in suppostion, by Bode and De Lambre: in fact, it was only an
extension of his preceding work, a corollary easy to be deduced
from it. The attempt by Mr Adams was merely a rude sketch, which
he was prevented from perfecting by the attempt to determine the
latitude as well as the longitude of the body sought
for. In trying to find out the inclination of the plane of the planet's
orbit; he wandered from the object directly before him; and the
calculations probably got entangled in nodes which Mr Adams
could not untie. M. Le Verrier, from the remoteness of the planet,
concluded that the plane of its orbit would so nearly coincide with
that of Uranus as to allow of its being assumed to be the same.
He thus, like another Alexander, cut rhe Gordian knot: this saved
time and gave him the victory. In the elements for the new planet,
given by Le Verrier, there is no notice of the inclination of its
orbit, nor of the line of its nodes...
(NB,
this is the finest British evaluation of the achievement, N.K.)
Airy
to Sheepshanks RAS, McA 33:11
Royal Observatory, Greenwich, 1846 Dec 17.
Dear
Sheepshanks,
Concerning the radius vector of Uranus -
The error was certain as to sign. It was determined
with reasonable accuracy as to magnitude (perhaps the probable
error might be 1/6 or 1/8 of the whole).
Now, suppose that Adams' elements which gave longitude-corrections
had given a wrong sign for the correction of the radius vector,
What would his theory have been worth?
_____________
The alternation of signs of errors + - in longitude does not
exclude any other hypothesis than that of an exterior planet. If
the law of force differed slightly from that of inverse square
of the distance (of which two years ago there was great probability)
and if tables were calculated strictly on the law of inverse
square of distance (as was done in existing tables) then the discordances
in longitude would have the alternate signs + -.
Adams
to Sheepshanks 1846 Dec 17 RAS
...
it is pointed out in my second letter to Mr Airy that my 1st solution
did give the correction of Radius Vector very nearly agreeing with
Obsn. & with respect to the 2nd I am surprised that any one
should imagine that after having obtained the elements of the orbit
of the disturbing planet from the perturbations in longitude, I
was unable to perform so simple & direct an operation as the
calculation from these elements of the corresponding correction
of the radius vector. - In fact, in the more usual way of calculating
the perturbations those of the Radius Vector are computed first
& those of longitude derived from them, and this was the method
which I actually followed in my first solution. The formulae for
this purpose are well known & are given in Pontécoulant...
Challis
to The Athenaeum Cambridge Dec 17
p.1300 No. 999, Dec 19
... M.Leverrier made another attempt to form tables [of Uranus]
and again proved the impossibility. The single important result
of the communication to the Paris Academy, on Nov. 10, 1845, was
the obtaining of correct values of the tabular errors...
Again, as to the error of radius vector: - it is quite impossible
that the longitude could be corrected during a period of at least
130 years independently of correction of the radius vector. If this
might be done on the Ptolemaic system it cannot be done on that
of Newton. The investigation of one necessarily involves that of
the other. Mr Adams actually employed a method of calculation which
required him to compute the co-efficients of the expression for
error of radius vector, before computing the co-efficients
of the expression for errors of longitude... M.Leverrier's communication
to the Paris Academy on August 31st- which really gave good grounds
for instituting a search - did not reach this country by the ordinary
channels of information till after the planet was actually discovered...
Challis
to Airy McA 33:12
Cambridge Observatory Dec 19. 1846
Why did not Adams answer your question? I know that he is extremely
tardy about writing, & that he pleaded guilty to this fault.
He experiences also a difficulty, which all young writers feel more
or less, in putting into shape and order, what he has done, and
well done, so as to convey an adequate idea of it to others by writing.
After receiving your questions it occurred to him that it would
be well for him to send you a full account of his methods of calculation,
& that he might send the answer at the same time. I believe
that nothing but procrastination in fulfilling this intention, was
the reason of his not sending an answer at all. I have always found
him more ready to communicate orally than by writing. It will hardly
be believed that before I began my observations I had seen nothing
of this in writing respecting the New Planet, except the elements
which he gave me in September written on a small piece of paper
without date.
I
first got an idea of the nature & value of his Researches by
an abstract which he drew up to produce at trhe meeting of the British
Association at Southampton. The public would hardly take such a
reason as that I have mentioned to be the true reason for his not
answering your question, and I fear, therefore, a hiatus must remain
in the History.
J.Herschel
to R.Jones RS HS 22:295
1846 December [no date]
Adams's Memoir is very admirable. He has taken over a perfectly
legitimate straightforward way of getting at his equations of condition
(at first I was not quite satisfied about this - but I see all is
quite as it should be) and his combinations are exceedingly skilful
and masterly. On the other hand so are LeVerrier's and he takes
a wider sweep in the whole conduct of his work. He goes into the
question by clearing the ground ab initio by a preliminary
total reconstruction of the theory of Uranus - a total reformation
of the tables - a total reduction of all the observations - a total
recalculation of all the places (300 in all [?]) and a comparison
of them with (not Bouvard's old tables but) his newer theory. Hence
he concludes positively and on sure grounds that the anomalous perturbations
of Uranus are no illusion no mistakes of calculation but a reality.
So much for Uranus.
...
It is a shame to make rivals and competitors of two men who ought
to be sworn brothers. Adams has the acknowledged priority in point
of time that nothing can shake but till the Planet was found
it was only a physical hypothesis upon trial, and no one can truly
deny also that LeVerrier shot fair, and brought down the
bird. Now my view of the matter is that there is quite enough
for both and if Adams is not to be praised because he is an Englishman!
Why is Leverrier to be blackguarded because he is a Frenchman? *
- Barring Newton's law of gravity (who never meddled with the planetary
perturbations) What Englishman ever furnished the smallest tottle
of a tool towards rigging out a man for such a struggle? It is all
French du fond en comble [?] Clairaut, D'Alembert, Laplace, Lagrange,
and more recently Poisson and Pontecoulant for the analysis and
Bouvard for the tables, which though not quite correct were
yet correct enough to raise the hue and cry. - The New Planet is
as much Laplace's as it is either Leverrier's or Adams's.
Mercy on us. What an outpouring!
Ever yours truly,
J.J.W.Herschel
*
[omission] Who made one and all of the formulae by which both have
grappled the planet but Frenchmen?
Airy
to Challis McA 33:13
R O Greenwich 1846. December 21
...But with regard to one part of your own published letter in the
last Athenaeum, I must make one remark. There were two things to
be explained, which might have existed each independently of the
other, and of which one could be ascertained independently of the
other: viz., error of longitude and error of radius vector. And
there is no _ priori reason for thinking that a hypothsis which
will explain the error of longitude will also explain the
error of radius vector. If, after Adams had satisfactorily explained
the error of longitude, he had (with the numerical values of the
elements of the two planets so found) converted his formula for
perturbation of radius vector into numbers, and if these numbers
had been discordant with the observed numbers of discordance
of radius vector, then the theory would have been false,
not from any error of Adams', but from a failure in
the law of gravitation.
On this question therefore turned the continuance or fall of the
law of gravitation. This, it appears to me, has been totally overlooked
in your letter. It was a question of vast importance.
...
What could be the reason of Adams' silence, I could not guess. It
was so far unfortunate that it interposed an effectual barrier to
all further communication. It was clearly impossible for me to write
to him again.
Sheepshanks
to Herschel Dec 26 1846 RS: HS 16:55
15pp
My
dear Sir John,
...
Be that as it may, the whole evidence as to Leverrier was out, understood
and believed, before anything was known of Adams,...
SUR LA DENOMINATION DE LA PLANETE NOUVELLEMENT DECOUVERTE
by
W.Struve Poulkova, ce 17 (29) Dec. 1846, 4 pages, 1-4
La partie de calendrier que publie, chacque annee, l'Academie des
sciences de St.-Petersbourg, est redigree a l'Observatoire central
de Poulkova. Dans le calendrier de l'annee 1847, la planete transuranienne
a du etre mentionee. Elle s'y trouve aux pages 3, 48 at 49, sous
la nomme de "Neptune" avec la signe du trident .
Une lettre de M.Le Verrier a M.O.Struve, datee du premier Octobre,
nous a determinee a adopter ce nom. M. Le Verrier ecrit: "Le Bureau
des longitudes s'est prononcee pour Neptune, le signe un trident.
Je repousse le denomination de Janus; il n'y a aucune raison de
croire que cette planete est la derniere du systeme solaire... [they
were too late to adjust their calendar after Arago altered the name
to 'LeVerrier', and don't like it anyway, N.K.]
Mis l'histoire impartiale, dans l'avenir, citera honourablement
et a cote de M.Le Verrier, aussi le nom de M.Adams, et reconnaitra
deux individus qui ont decouvert, l'un independament de l'autre,
la planete au-dela d'Uranus. C'est ainsi qu'elle attribue
la decouverte du calcul infinitesimal a Leibniz et a Newton...
En consequence, nous conserverons le nom de Neptune et nous ne l'abandonnerons
que lorsque, dans la suite, la voix generale se sera decidee en
favour d'un autre nom.
Herschel
to Whewell Dec 29 1946 RS HS 22:294, 18:209
My
dear Whewell,
...
On the other hand Galle looked for it and found it on the sole
ground of Leverrier's place, while Challis cannot shew that he looked
for it (when at last he did so) purely and simply by Adams's. When
he began to look he had already a knowledge of Leverrier's results,
and he did not find it till after Galle had done so - for
I do not call finding an individual object merely including it in
a crowd of others (without knowing that it is there, and rather
suspecting it not to be) with an intention of examining
them at leisure to ascertain if it be among them or not - Nobody
but Sheepshanks will ever say that Challis found it before
Galle.
Until the planet was actually seen and shewn to be a planet - there
was no discovery - except in so far as a successful physical hypothesis
is one.- Certain motions have to be accounted for. A and B unknown
to each other frame an hypothesis to account for it - A does - earlier
than B - B does subsequently to A but more thoroughly - goes more
into detail - finds it satisfy all minutiae. Assuredly A has gone
a certain way to establish the hypothesis - many may have been induced
by him to believe it true - many more by B's enquiries. - But before
it can be received as an established hypothesis and called a discovery
there is yet a step - it has to be tried whether other rival hypotheses
will not do as well or better - till this has been done - till men's
minds are made up to call the "Theory" - a "fact" there is no discovery
- The sight of the actual thing of course forces them to
do so at once.
On the back of what is presumably JH's copy of this letter, he has
written in pencil:
God
forgive me for writing in this way - The truth lies on the other
side & Adams is the 1st theoretical discoveror of Neptune. The
whole thing was marred and ** by Airy's indefensible reticence.
On him be the responsibility of the (temporary) transferring of
one of the brightest stars of [?] Britain's scientific ** to France.
Dec
30 Airy to A. De Morgan R O Greenwich 1846 Dec 30
My
dear Sir,
Perhaps you have read the Mechanics Magasine, if not, I hope
you will see the No. for December 26: there is the most singular
piece of insanity in the history of the New Planet that I could
have conceived. Yours very truly,
Herschel
to Airy McA 33:14
1847 Jan 7
...
I have within these 2 days got Le Verrier's Book - and I must say
my impression is one of unbounded admiration. There is no part of
the subject shied or slurred over - a tabula rasa - and a
total reconstruction with a view from the beginning to the crowning
pinnacle of the whole edifice. It is an Epic Poem complete in beginning
middle & end with a catastrophe [sic] such as could not possibly
be heightened by any additional circumstances. I am sorry for
Adams & for England, but it would really have been a pity
that so superb a struggle should not have been crowned with victory
as a spectacle for Gods & men.
Sheepshanks
to Schumacher Jan 11 1847 McA 34:16
My dear Sir,
....We had a long and rather warm discussion at our Society on the
8th _ propos of the medal. It ended, oddly enough in our not being
able to give one because our rules don't allow us to give
two. I suppose this will be alluded to at our annual meeting
in February; but it is difficult to say what will be the result,
nor, (now the main fact are known) does it much matter..... M. Arago
has carried his power of nomenclature too far in raising a modern
to be a companion with the heathen deities. The usage only gives
a choice among the inhabitants of Olympus. We all call Uranus, Uranus.
The "Georgian" was retained in the Nautical Alamanc by a weak deference
to the wish of Herschel's doating son. Sir John worships his father
& we almost adore Sir John. But the "Georgian" will go the way
of all flesh & disappear from the N.A. before long.
Airy
to LeVerrier McA Box 33:15
R O Greenwich 1847 Jan 12
..
I intended my paper as a history of all that I know bearing upon
this wonderful discovery: and I wish that you or some person well
acquainted with what has been done in France would write your portion
of the history.
I very much wish that you would pay a visit to England. It would
gratify me very much to have the pleasure of receiving you in my
house. I am sure you would find that in England, not only among
men of accurate science but also among the people generally, there
is no national feeling adverse to the respect due to you: which
is not incompatible with the assertion of some claims in favour
of Mr Adams. Since your book arrived, I have conversed on it with
only two competent judges of its merit, Sir John Herschel and Sir
J.W.Lubbock: and they regard it with the most unbounded admiration.
Will you now permit me to mention a subject of the utmost delicacy,
which I mention now in the most private way only because I am confident
that, if it is not now mentioned privately, it will soon be mentioned
publicly: I mean the name of the Planet. - From my conversation
with lovers of astronomy in England and from my correspondence with
astronomers in Germany, I find that the name assigned by M. Arago
is not well received. They think, in the first place, that the character
of the name is at variance with that of the names of all the other
planets. They think in the next place that M.Arago as your delegate,
could do only what you could do, and that you would not have given
the name which Mr Arago has given. They are all desirous of receiving
a mythological name selected by you.
In these feelings I do myself share. It was believed at first that
you approved of the name Neptune, and on that supposition
we have used the name Neptune when it was necessary to give
a name. Now if it was understood that you still approved of the
name Neptune (or Oceanus as some of my English mythologists suggested
- or any other of the same class), I am sure that all England and
Germany would adopt it at once. I am not sure that they will adopt
the name which M.Arago has given.
Airy
to C.Wentworth Dilke R O Greenwich 1847 Jan 13
Dear Sir,
I am much obliged by your giving me the opportunity of perusing
the letters of your Paris Correspondent relating to the New Planet;
I now return them. You may depend on my caution with regard to the
writer's name.
I received yesterday the National of Oct 8, 14 & 21. I had before
seen the section of that of the 21, which Mr Arago officially disclaimed
in a letter to me - which letter I communicated to the Athenaum
of the following week. I am told that Mr Arago moved the expulsion
of the National editor from the meeting soon after the article,
but that his motion was rejected. The whole series is very interesting.
Now, most astronomers dislike the name Le Verrier, as indelicate
on the part of Le Verrier's deputy, and as alien in its derivation
from all other planetary names. And we only want a fair degree of
authenticity for Le Verrier's public approval of the name Neptune
to adopt it at once.
Herschel
to Adams 1847 Jan 18 JCA 9:15 not RGONE
Dear
sir,
In this point of view (and setting aside all question of rivalry
and competition between two men whose names will go down indisputably
linked together to the latest posterity and between whom, if even,
there ought to be a brotherhood of mutual admiration and regard)
I can not help considering it as fortunate for science that this
should have happened. All idea of a lucky guess - a mutual destruction
of conflicting errors - of a right result got at by wrong means
is precluded - and the most reluctant to accord any merit to theories
must be bound to admit that in this matter at least theories are
facts. "In the mouth of two witnesses shall a thing be established."
- and the thing to be established seems to me to be less that such
a body exists (though there is a fine part) but the maturity of
a science which, beyond all power of gainsaying or cavil could lend
two different enquiries independent of and unknown to each other
to so coincident & exact a prediction of it in numero pondere
et mensura.
Struve
to Challis Pulkova Observatory 23 Jan/4 Feb 1847
IoA, V
...
the name of Le Verrier would be against the accepted analogy and
against historical truth, as it can not be denied that Mr Adams
has been the first theoretical discoverer of that body, though not
so happy to effect a direct ** of his indications.
Airy
to Adams Jan 25 JCA 2:3 McA 33:16
Dear Sir,
In your paper on the New Planet, you express a wish that the manuscripts
of Flamsteed's observations would be examined with refrence to the
1690 observations. I have carefully compared the MSS and the printed
volume for all the days in 1690 and 1715 on which observations of
Uranus were made, and I find that (with the exception of some trifling
matter in the description of the stars) the printed volume is an
exact and accurate copy of the MSS. The Index Error is not included
in the MSS.
There is not the smallest appearance of any thing suspicious about
the 1690 observations.
(NB,
There was a problem in explaining the 1690 perturbation, NK)
LaVerrier
to Airy Paris Jan 29 1847 RGO McA 33:17
Monsieur
et cher Confrere,
J'ai lu avec attention la notice historique que vous avez presentee
a la Societe Astronomique. Je vous remercie des termes dans lesquels
vous avez parle de mon travail et de ce que votre derniere lettre
renferme d'obligeant a ce sujet. Vous etes, Monsieur, du petit nombre
des astronomes a qui la mechanique celste est familiere....Apres
que j'eus donne mes memoires, et l'orsque je fus convaincu qu'on
trouverait la planete ou j'avais dit, je crus naivement qu'on l'appelerait,
Planete de Le Verrier, comme dit Comete de Halley,
Comete d'Encke, Etc. Voila tout.
quand la planee fut trouvee, il fut proposee par le Bureau
des Longitudes de l'appeler Neptune. Je ne faisais point
partie du Bureau a cette epoque, et je ne l'avais pas charge de
cela. En ecrivant a divers astronomes, je leur dis ce que le Bureau
avait fait; mais sans ajouter ni blame ni approbation.
(NB,
There is doubt whether the Board of Longitude had any part in choosing
the name., NK)
Whewell
to Airy Feb 8 1847
Have you astronomers decided yet the name of the new planet?
Airy writes at base: No name is yet well received for the Planet.
Airy
to Athenaeum Name of the New Planet
R O Greenwich Feb 18
I do think with Mr Struve that the decision of a deputy is far less
binding than that of the original discoveror: and I think it particularly
necessary in the present instance to distinguish between these powers,
because an attempt (which I must characterise as indelicate) has
been made by the deputy to perform an act which was beyond the power
of his principal, viz. to attach to the planet a name which no one
in the position of a principal would have dared to attach.
Airy
to Lev. McA Box 34:1
Royal
Observatory, Greenwich, 1847 Feb 28
My dear Sir,
..
In my last letter I stated to you the difficulty in which I found
myself, and in which nearly all the astronomers of Europe found
themselves, with regard to the name of the new planet. I hoped that
perhaps you might give me some sanction for the adoption of a mythological
name. Your reply, which was conceived in terms of the utmost frankness,
clearly showed to me that you were unable to make the change which
appeared desirable. I determined therefore to take no positive step
in adopting a name for the the planet until circumstances should
compel me to do so. These circumstances, I think, have arrived:
the reports of the principal astronomers of the North of Europe
reached me about 12 days ago; and the determination, to which they
had come, agreed, as I hear, with the wish of my English friends
in general. I therefore definitely adopted the name Neptune, and
I published this adoption in the number of the Athenaeum of which
I enclose parts.
Babbage
to RAS Council RAS 12th March
As I take a warm interest in the success and character of the Astron.
Society I am anxious to be permitted very shortly to state the course
I should have advocated.
1st. That the modern law relating to discoveries is, that they take
their date from the time of their first publication to the world
In this case I think there can be no doubt as to priority of publication.
...
2nd. I concur entirely with the majority of the late council that
the last medal ought to have been awarded to M. Le Verrier. And
I much regret that the small minority of that council should have
availed themselves of a privilege conferred upon them by the Society
to prevent the awarding of medals to any discovery not eminently
fit for them, into a means of preventing any such award in the strongest
case which has yet occurred during the existence of the Astronomical
Society.
Proc.
Amer. Acad. Arts & Sciences, March 16, 1847
ON THE NEW PLANET NEPTUNE
Professor Peirce communicated to the Academy the following notice
of the computations of Mr Sears C.Walker
'The
inequality of (2μ-μ'), if the mean distance is nearly
30, is the most remarkable yet discovered in the primary solar system'
From
differences in orbit, the conclusion 'the planet Neptune is not
the planet to which geometrical analysis had directed the telescope...
Its discovery by Galle must be regarded as a happy accident'
...
It is not, however, a necessary conclusion that Neptune will not
account for the perturbations of Uranus, for its probable mean distance
of about 30 is so much less than the limits of previous researchers,
that no inference from them can safely extend to it. An important
change, indeed, in the character of the perturbations takes placed
near the distance 35.3; so that the continuous law by which such
inferences are justified is abruptly broken at this point, and it
was hence an oversight in M. Le Verrier to extend his inner limit
to the distance 35. A planet at the distance 35.3 would revolve
around the sun in 210 years, which is exactly two and a a half times
the period of the revolution of Uranus. Now, if the times of the
revolution of the two planets were exactly as 2 to 5, the effects
of their mutual influence would be peculiar and complicated, and
even a near approach to this ratio gives rise to those remarakable
irregularities of motion which are exhibited in Jupiter and Saturn,
and which greatly perplexed geometers until they were traced to
their origin by Laplace.
The observed distance 30, which is probably not very far from the
mean distance, belongs to a region which is even more interesting
in reference to Uranus than that of 35.3. The time of revolution
which corresponds to the mean distance 30.4 is 168 years, being
exactly double the year of Uranus, and the influence of a mass revolving
in this time would give rise to very singular and marked irregularities
in the motions of its orbit. The effect of a near approach to this
ratio in the mean motions is partially developed by Laplace, in
his theory of the motions of the three inner satellites of Jupiter.
The whole perturbation arising from this source may be divided into
two portions or inequalities, one of which, having the same period
with the time of revolution of the inner planet, is masked to a
great extent behind the ordinary elliptic motions, while the other
has a very long period, and is exhibited for a great length of time
under the form of a uniform increase or diminution of the mean motion
of the disturbed planet. But it is highly probable that the case
of Neptune and Uranus is not merely that of a near approach to the
ratio of 2 to 1 in their times of revolution, but that this ratio
is exactly preserved by those planets...
Washington
Daily National Intelligencer 1847 March 26
LE VERRIER'S PLANET
We have been favoured with the following extracts from a letter
from Professor BENJAMIN PIERCE, of Harvard University...
From the most careful examination of the observations which have
been made upon (Neptune?) I am firmly convinced that it is not the
planet predicted by analysis, so that its discovery must be regarded
as a happy accident... I may safely go further, and state that the
investigation of the effect of this planet upon Uranus is not included
in the researches of either LeVerrier or Adams, and this interesting
field of inquiry is yet to be explored... With such a mean motion
[one half that of Uranus] some of the irregularities of motion will
become extraordinarily large....
I would not have you suppose that I am disposed to contest in the
least the greatness of Le Verrier's genius. I have studied his writings
with infinite delight, and am ready to unite with the whole world
in doing him homage, as the founder of a wholly new department of
invisible astronomy.
Adams
to Airy McA 34:2
St John's Coll. 28th April, 1847
I have lately calculated a new set of elements, supposing the star
which, as noticed by Messr's Walker & Petersen, was observed
by Lalande on May 10. 1795 but is now missing, to be the planet
Neptune. The elements founded on a combination of this with the
modern observations confirm my previous results & give an approximate
value of the eccy. & long. of perihelion, which were
left doubtful by my former solution... I am going to write to Mr
Stratford to suggest that this would be a very proper occasion for
altering the name "Georgian" in the Nautical Almanac into "Uranus"
in order to conform to the general usage among Astronomers all the
world over.
Airy
to Adams 1847 April 29 JCA 2:4 not RGONE
...
I shall be anxious to see your calculation of perturbations with
the new elements, and to see the whole of your discussion of the
mathematical causes of the very near agreement of the predicted
place with the observed place.
Roderick
Muchinson to Airy Paris 21 May 1847 McA 34:3
...
It appears to me to be clear, that Arago had nothing whatever to
do with the suggestion of the name "Planète Leverrier".
He had, on the contrary, agreed with M.Leverrier, that it should
be called Neptune, & the memoir calling it was actually printed
& taken to the press by M.L.. The latter called soon after and
began lamenting about the name & saying "on m'a dit que ..."
... On this Arago got into a rage with his protege & wheeled
him off. The next day L. came back & throwing himself on Arago's
mercy & goodness of heart, implored him to adopt the
name Leverrier in order to serve him as a friend & a fellow
countryman. Thus appealed to "en misericorde", Arago assented, but
on the condition that Uranus should always be called (as he A. had
previously termed it) Planete Herschel.
[L.
then fails to accord with this, and prints a memoir about 'Uranus']
... a quarrel takes place... a variety of intrigues ... as the board
of Longitude and all the Astronomical section are hostile to Leverrier...
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