&: 
Gg, 
No. 
108. 
109. 
110. 
111. 
113. 
114. 
116. 
117. 
Year. 
Astronomical and Nautical Collections. 
t 
p-360, 490. Berl. Astr. Jahrb. 1809. Conn. des tems. 1808, 
1809. ‘ : 
1806. Discovered by Pons the 10th November: observed first till the 
20th Dee., and then again from the 17th Jan. to the 12th Feb. 
1807. Mon. Corr. XV. XVI. Berl. Astr. Jahrb. 1810. Conn, 
des tems, 1810. p. 298, 1819. 
1807. Great comet. Observed from the 22d Sept. 1807 to the 27th 
March, 1808. Most of the observations are collected in Bes- 
sel's Untersuchungen tiber den grossen cometen, 4, Kénigs- 
berg, 1810. Besides this classical work see also Mon. Corr, 
XVI. XVII. XVIII. XIX. Berl. Astr. Jahrb. 1811, 1812, 
1813, 1814. Cacciatore della cometa di 1807. Conn. des 
Tems, 1809, 1810, 1811, and Phil. Trans. 1808. 
1808. Discovered by Pons, the 24th June, and somewhat uncertain, 
1810. 
. 1811. 
‘Isil. 
1812. 
especially with respect to the declinations: observed only at 
Marseilles, from the 26th June till the 3d July, Mon. Corr. 
XVIIL. p. 245, 359. Berl. Astr. Jahob. 1812, p. 129. j 
Discovered the 22d August by Pons, and observed very doubt- 
fully at Marseilles only from the 29th Aug. to the 21st Sept. 
Mon. Corr. XXIIL. p. 802., XXIV. p. 71. Berl. Astr. Jahrb, 
1814, p. 179. 
Discovered by Flauguergues the 26th March, and observed in 
Europe before the perihelium till the 2d June, after the peri- 
helium from the 20th August to the 11th Jan. 1812: lastly 
rediscovered by Wisniewski, at New T'sherkask, the 31st 
July, 1812, and observed again from the Sth to the 17th of 
August. Upon this great comet, very remarkable even in its 
form, and observed by almost all astronomers, besides the 
Mon. Corr. XXUI. XXIV. XXV. Phil. Trans. 1812. Berl. 
Astr. Jahrb. 1815, 1816. Conn. des tems, 1820, and so 
forth, see especially the excellent treatise of Dr. F. W. A. 
Argelander, Ueber die Bahn des grossen cometen von 1811, 
4, Kénigsberg, 1822. The orbit of Argelander, inserted in 
the table, is that which he considers as the most probable : but 
the observations made at the different times of the comet's 
appearance could not be quite satisfactorily represented by any 
orbit governed by the Keplerian laws. Argelander reckons 
from the place of the mean equinox the 12th Sept. 1811. 
Discovered by Pons the 16th November, and observed last at 
Bremen, the 16th February, 1812. Conn. des tems, 1820. 
Mon. Corr. XXIV, XXV, and especially XXVII. Nicolai 
reckons from the mean equinox on the Ist Jan, 1812. 
Discovered by Pons the 20th July, and observed till the end of 
September. Mon. Corr. XXVII. XXVIII. Con. des tems, 
1820: but see especially the Zeitschrift for 1817. Encke 
reckons the longitudes from the mean equinox of the Ist Sep- 
tember, 1812. 
5. 1813. Discovered by Pons the 4th February, and observed till the 11th 
March. Mon. Corr. XXVII. Conn. des tems, 1820. 
1813. Discovered by Pons at Marseilles, and Harding, at Gottingen, 
the 2d and 3d of April: observed till the 29th. Conn, des 
tems, 1820. Mon. Corr. XXVU. XXVIII. 
1815, Discovered by Olbers the 6th of March: observed last by Gauss, 
the 25th of August. Bessel has taken the perturbations into 
