Astronomical and Nautical Collections. 95 
No. Year. 
38 -aecount for his elliptical orbit. Period, according to Nicolai, 
74.7893 years ; according to Bessel, 74.04913. Bessel com- 
putes, that taking all the perturbations into account, the 
comet will reach its periheliam again in as early as 1887, Feb. 
9.4, that is $24.5 days earlier than the period of the simple 
elliptic orbit. Berl. Astr. Jahrb. 1818, 1819. Observations 
at Konigsberg, If. Zeitschrift for 1816. Trans. Berl. Acad. 
. 1812, 1815. Math. Class. Wonn. des tems, 1520. Bessel 
reckons the longitudes from the mean equinox of the Ist Jan. 
Nicolai from the 26th April, 1815. 
118. 1818. Discovered by Pons the 26th Dec. 1817: observed last at Bre- 
men the Ist May 1818. The comet was on account of the 
faintness of its light very dificult to be observed, and ap- 
peared to be gradually dissolved. Berl. Astr, Jahrb. 1821. 
Zeitschrift for 1818. Conn. des tems, 1821. 
119. 1818, Discovered by Pons the 29th Nov. 1818 ; afterwards by Bessel 
the 22d Dec. Last observed by Harding the 30th Jan. 1819. 
Berl. Astr. Jahrb. 1821, 1524, Conn. des tems, 1821. Corresp. 
Astr. IL. p. 187. 
(86.) 1819, Reappearance of the celebrated comet of Encke, by which its 
short period of 1207 days was first ascertained. Discovered 
by Pons the 27th Nov. 1818: observed last the 12th Jan. 
1819. Only the last elliptic orbit of Encke is to be considered 
as the true one. Corr. Astr. 1819. Berl. Astr. Jahrb. 1822, 
1823. Conn. des tems, 1522. Encke reckons the longitudes 
from the mean equinox of the 1st Jan. 1819. 
120. 1819. Appeared suddenly in Europe emerging from the sun’s rays in 
the beginning of July, of a considerable magnitude. Last 
observed in October at Dorpat and at Bremen. Is remark- 
able, because, according to the elements, it must have passed 
over the sun’s dise on the 26th of June. Corr. Astr. 1819. 
Berl. Astr. Jahrb. 1521, 1822. Conn. des tems, 1822. 
121. 1819. Discovered by Pons the 12th June, and only observed at Mar- 
seilles and in Milan till the Joth July. Only the last orbit, 
by Encke, agrees with the observations, which cannot be re- 
presented by any parabola. Corr. Astr. 1819. Berl. Astr. 
Jahrb. 1822, p. 243; 1823, p. 221. Efem. Milan. 1820. 
Encke computes from the mean equinox of the Ist Jan. 1819. 
122, 1819. Discovered by Blanpain at Marseilles the 28th Nov. : observed 
_ last at Milan the 25th Jan. 1820. Observed also at Bologna, 
and especially at Paris. he great deviation of the orbit 
from a parabola is not to be doubted ; but the limits of the 
time of revolution have not hitherto been found assignable, 
on account of the too short interval between the observations 
which have been published, and which are in some degree of 
deubtful accuracy ; those of Marseilles not having been ob- 
tained by the most earnest entreaties and demands. Corresp. 
Astr. 1820. Berl. Astr. Jahrb, 1824, Conn, des tems, 1824. 
Encke reckons from the mean equinox of the Ist June, 1820. 
123. 1821, Discovered at the same time on the 2lst Jan. by Nicollet at 
Paris, and by Pons at La Marlia. Was observed in Europe 
till the 7th March, and after the perihelium, from the Ist 
April till the 3d May at Valparaiso, by Captain Basil Hall, 
Lieutenant W. Robertson, and Mr. H. Forster. Its apparent 
