174 
Scie7d^LC IntclUgertce. 
S. Longitudes deduced from the Solar Eclipse <f "ItJi SepL 
1820.r~Professor Wiirni of Stutgard has deduced the following 
longitudes in time from the eclipse of the 7th September 1820 : 
Madrid, - 
24' 8.9 W. of Paris. 
Riga, 
1^27' 8" East. 
Qreenwich, (Pond), 
9 20.3 West; 
Nienstedten, 
30 7.5 
Amsterdam (Keyzer), 10 6,2 East; 
Moskau, 
2 21 20 
Geneva, 
15 13.8 
Bologna, 
37 5.0 
Zurich, 
24 56.8 
Bogenhausen, 
37 39 
Marpurg, 
25 43.6 
Bergen, 
11 46.9 
Genoa, 
26 27.1 
Speier, 
24 25.1 
Hamburg (Rumker), 
30 38.1 
Darmstadt, 
25 16.9 
Marlia, near Lucca, 
33 2.7 
Cuxhaven, 
25 31.6 
Rome (Colleg. Rome), 40 34.3 
Regensburg, 
39 3.7, 
Copenhagen, 
41 5.0 
Fiume, 
48 21.6 
Dresden (Math. Sal), 
45 47.2 
Shumacher’s Astronomische NacJiricliteu, No. 9- p- 131. 
4. Astronomical Positions cf Places. — M. Hansteen of Chris- 
tiania has found, from numerous observations, that the longU 
tude of Christiania, East of Paris, is 33' 39'^ 
M. Knorre and Admiral Greig have determined the latitude of 
Nicolajef to be 46° 58' 33", by a repeating circle of Reichenbach. 
Professor Waldeck of Abo has found the position of his ob- 
servatory, which is the most northern in the world, to be 60° 26' 
58" North Lat. and 19' 48" East of Paris. He expects, how- 
ever, to be able to obtain a more accurate determination with 
the instruments which he is receiving from Munich. 
Professor Struve of Dorpat makes the longitude of his obser- 
vatory 37' 35" East of Paris, and its latitude 58° 22' 47". 
The latitude observed by a circle of Baumann’s is correct with- 
in 2''^ ; but there may be an uncertainty of a few seconds in the 
longitude. ' 
5. Comet of 1821. — This comet was discovered at the Royal 
Observatory of Paris by M. Nicollet on the 21st January 1821, 
and on the same day by M. Pons in La Marlia. Dr Olbers 
^found it on the 30th January; and it was observed at Slough 
by Mr J. F. W. Herschel on the 27th February. The follow- 
ing are its elements : 
Passage of Perihelion, March 21. 1821, 9*^ 33' 7" Mean Time at Paris. 
Perihelion distance, - - - 0.091113 
Longitude of Ascending Node, - - 48° 32' 12" 
Longitude of Perihelion, or Orbit, - - 239 18 37 
Inclination of Orbit, - - - 74 10 53 
Heliocentric Motion, 
Retrograde, 
