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T\JZ 648. DER ASTRONOMISCHEN N A CH R I C H T E N.
Schreiben des Herrn Airy's, Konigl. Astronomen in Greenwich, an den Herausgeber .
Royal Obaervatory, Greenwich 1848.
Auguet 15.
YOU
will before this time have received copies of m y Reductions of the lunar Observations made a t Greeumich from 1750
to 1830. T h e whole number of observations of right ascriision
of the Noon which are completely reduced i s 9067. Of these
674 are not accompained b y any obersvations, or by thruatworthy
observations in Korth Polar Distance, leaving 8393 observations, complete i n both elements, and as good a s the nature
of the instrunients permitted. These have been reduced with
great care; and every observation has been conipared with the
place given by theory. T h e form of theory adopted for this
comparison is Plana's modified in a very few terms. T h e application of the theory to coniputatiorr of the Moon's Pliice is effected by nieiliis of Unnioisenu's Tables of 18?3. several subsidiary tables having been added which express the difference
Letween Danioiseau's and Plnna's theories. T h e epochs and
mean motions retained are Domoiseau's. Iii the concludirig
part of the printed book, the coniparisons of theory with observation are grouped i n groups determined by the cliilnges
of sign of the principal equations or of the variations depentling
on chariges in the argument.
By means of the quantities last mentioned, I have investigated thc corrections of the principal elements of te Moon's
orbit. In regard to the Moon's mean place. I have added to
the theoretical places in the groups of observations, the effect
of Haizsen's two inequalities of long period produced hy the
action of Venus. T h e corrections therefore apply to the theory
as rendered complete b y Ransen. I n the statements which
follow, the coefficients are: given in s e x a g e s i m a l scconds,
but the arguments and mean motions are expressed b y the
c e n t e s i m a l Division.
1. Moon's mean longitude.
Damobeau's epoch is correct for 1814. for Jan. 1. Oh Greenwich Mean SolarTime,
it is 4 4 g 23' 98"2.
RIotion in 365 d a y s 143g 76' OB"88.
Motion in 100 Gregorian years 3279 45' 86"2.
Increase on Damoiseau'a secular motion 39"3 or 1'21"4.
2. Equation depending on the place of the Noods node
T h e true value deduced from the reductions is
6"35 sin. long. node.
- 0,97 c m . long. node.
T h e second term is not required by.tbeory: but its existence
appears certain.
3. Equation of t h e center.
T h e coefficient of the first term, when the expression is madein
Plans's F o r m , is 22639"14, very certain.
4. Mean Anomaly.
Damoissau's epoch is correct for 1788: its value a t Jan. 1. Oh
Greenwich Mean Time is ii o g 59' 47".
Diminution of secular motion of mean anomaly 31'6 or 97".
Rlotion of mean anomaly in 1 0 0 Gregorian years 206s 39 '80".
5. Small terms, depending on anomaly and node.
6. Parallactic Equatioii.
Plana's coefticient 1 2 2 ~ ~to1be increased by +OU27: not very
certain.
7. Variation.
Plnna's coefffcient 23iO"3 to be increased b y t O " 6 8 not very
cnrt ai n.
8. Annual Equation.
Plasn's coefficient 668"6 to be increased by I f / 6 7 : pretty certain.
9. Evretion. Plnnn's coefficient 4585"6 to be increaced b y
1'28: very certain.
10. Constant term of Parallax.
by errors
Thj,q is subject to fiOme uncertainty, as it is
of the Quadrant and errors of BcsseZ's latitude. T h e best
value that 1 can give from all the observations (wben the parallax is expanded in terms of the m e a n longitude) is 3425"39
+
corresponding to a mass of the Moon
1
=99,s'
But the latest
observations give a value approaching nearer to Plana's 3423'16
corresponding to a mass
i
=still they
88
require a small increa-
s e of Plana's.
It is my intention, in the future reductions a t Greenwich,
to increase Burckhardt's parallax by-
I
part.
1200
1 1 . Inclination of the Moon's orbit.
Plann's value 18537"9 is to be diminished by 2"44 : very certain.
12. Argument of latitude.
Damoiseau's epoch is correct for 1782 : its value at Jan. 1. Oh.
Greeuwich Mean Solar Time is 1179 70' 14".
Dimintion of secular motion. 63" or 196" 6.
Motion in 100 Gregorian years 769 44' 12".
1
13. Terms depending on the true longitude of the Moon.
T h e corrected term in EclipticNorth Polar Distance i s
-8"75 sine true longitude +2/'17 cosine true longitude.
T h e second term is not recognized b y theory, but its existence appears perfectly certain.
14. Evection in Ecliptic North Polar Distance.
Plana's coefficient 521"5 is to be diminiehed b y O"24: not
very certain.
1 may mention, that the comparison of the Observed with
the Theoretical Places is arranged in such a way that it will
b e comparatively easy to investigate the correction of the
coefficient of any inequality.
G. B. Airy.
E n c k e ' s Comet.
4h50"'17'65
$45°12' 39"9
Argelander's Zonen.
Herr Sonntag hat den Encke'schen Kometen hier am 24.
A
11
auf besoudere Genauigkeit machen kann, hat er sie doch niit
der Ephemeride verglichea. Der Comet erscheint mie ein Nebel-
z e i g e .
Durch das Zerwiirfniss zwichen den Prinzipalen und den
Geliiilfen in deli Druckereirn, ist die rasche Erscheinung der
Ietzten Nummern diescs Bandes gestlirt. Es scheinen jetzt beide
Parteien sich vereiriigt zu haben, und so darf ich hoffen. d a k
cler nachste Rand, fur den d a s Material sich angehsuft hat,
und der mit einer hinterlassenen Arbeit Besseb fiber d a s Saturns-SystemanfAngt, den gewlihnlicheu schnellen Fortgang halren
rverde. Meine geehrten Herren Correspondenten bitte ich die Vetspiitung des Abdrucks ihrer Einsendungen a u s den eben angefiihrten Urnstanden zu erkliiren und zu entschuldigen.
~'3.
A n z eige.
Ea
ist schon in den friiheren Binden dieser Nacliriehten bemerkt, d a b olinc ausdriickliche Bestellung und Vorausbezahlung keine
Nunimer cines neuen Bandes versandt wird.
Die Herren Abunnenten, welche diese Blatter furtzusetzen wiinschen, werden a180
rraucht , uin Unterbrecliungen zu vermeiden , baldmjglichst ihre Bestcllungcn einzuscndon.
Man priinumerirt init 8 # Hamburger GrobCourant, und von diesem Preise wird auch den Buchhandlungen und Postlmtern kein
Rabntt gegeben, die also nothwendig ihren Abnehrnern haliere Preiie berechnen miirsen. Ueberhaupt sind alle in dieser Anzeige beinerktcn Preiae, N e t t u p r e i a e.
Einzelne Xumincru werden nur zur Completirung , wenn sic vorrithig mind , h 4 ggr. abgelasscn.
Da selir wenig Exeinplnre mehr gedruckt werden ala bestellt sind, 80 kann ein Band, der adion geschlosscn ist, nicht unter
12
EIainburger GrobCoiirant verkauft werden. Die einzige Ausnahine ist , wenn alle sehon gesclilossenen Biinde, vom 5tm (inclusive)
an, auf einmal p i u r n m e n werden , wodorch keinee vun den wenigen noch iibrigen Exemplaren des ganzen Werkea ineomplet gemaclit
wird. I n cliesein Falle wird der Band nur zu 8
gerechnet. Die 4 erstrn Binde sind ganz vcrgriffen.
8
I n h a 1 t.
(Zu Nr. 648.) Sclireiben des Herrii Observators Schmidt a n den Herausgeber.
Sclireiben des Herrn Dr. Wichrnann an den Herausgeber. p. 371.
Schreiben des Herrn Directors Runcker an den Herausgeber. p. 371.
Schreiben des Herrn J . R. Hind an den Herausgeber. p. 373.
Sclireibeii des Herrn Dr. Erunnow on den Herausgeber. p. 373.
p. 369.
Vergleichung der von Hcrrn Sonntag herechneten Elemente des von Herrn Dr. Putorsen entduckten Cometen (siehe p. 367) mit
allen bisher hekaiint gewordcnen Beobachtungen. p. 381.
Schreiben des Herrn PZantuninur an den LIerausgeber. p. 383.
Schreiben des Irerrn Prof. Airy an den Herausgeber. p. 385.
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