Astronomy: ITS 
By taking into account the disturbing forces of the planets after 
the comet had ceased to become visible, M. Argelander obtained 
the following elements : 
Limits of 
jj. Error. 
Passage of Perihelion, M. Time at Paris, September, 12.263804 HH 0.00095 
Distance of Perihelion from Node, - - 65° 24' 10".026 I ~ 3."597 
Longitude of Perihelion, - - - 75 0 33.926 ~~i~ 3.941 
Longitude of Node, » - . 140 24 43.952 zt 1-610 
Inclination of Orbit, - ’ - - 106 57 38.765 ~d~ 1.270 
Perihelion distance, - - - » 1.03542283 ~f~ 0.0000083 
Excentricity, _ . _ _ 0.99509330 ~1~ 0.000043 
Period:, . - - - Years, 3065.56 zt 42.9 
See Shumacher’s Astronomische Nachrichten^ No. 9. p. 119- 
2. Greenwich Observations on Venus and Jupiter^ compared 
with the Tables Lindenau and Bouvard. — The Board of 
Longitude has just published a pamphlet, entitled, ‘‘ The Lorn 
gitudes and Latitudes of Venus and Jupiter, deduced from ob- 
servations made at the Royal Observatory, compared with the 
Tables of Lindenau and Bouvard.” There are 147 observa- 
tions of Venus ^ one of which is rejected, and is not calculated 
for latitude, and one is exactly the same in longitude as* the 
place calculated by Lindenau’s Tables. The remaining 145 ob- 
servations give the mean of Lindenau’s Tables for longitude 
— 1''.8, and the maximum of error — 13."7. In latitude, the 
mean error is — 3". 4, and the maximum — 14".7. There are 
66 observations of Jupiter^ and they give the mean error of the 
same Tables for longitude -|- 13".3, and the maximum error 
-P 31".5. For latitude, the mean error is -f 5^/, and the maxi- 
mum + 10". 
The greatest errors in longitude are confined to 1820, since, 
from the observations of 1819, the mea7i error is 0".3, and the 
maximum is 6.2 ; whereas, from the observations of 1820, 
the mean error is + 22". 8, and the maximum + 31. "5. Three 
longitudes of 1820 are calculated likewise by Bouvard’s Tables 
of 1821, and by them the mean error comes out + ll".l, and 
the maximum + 20". 0. It is remarkable that all the errors of 
both Tables are in excess for the longitude in 1820 ; and that 
of the 66 observations 64 give the error of the Tables in excess 
for the latitude. 
