Captain Hall's observations of a comet , &c. 
47 
Table, showing the Places of the Comet seen at Valparaiso, in April and May 1821. 
Latitude 33 0 2' 18", 9 S°. Longitude 71 0 36' W. 
As observed by Capt. Basil Hall, Lieut. William Robertson, and Mr. Henry Foster, 
of His Majesty's Ship Conway. 
Date. 
Mean Time. 
.it in Time. 
Declination. 
(South.) 
Stars with which the 
Comet was compar- 
ed. (From Con. des 
Temps,. 1819. 
Interval between the 
Passage of the Co- 
met and the Star. 
(Sidereal Time.) 
Difference of decli- 
nation. (Comet 
S c .orN°of >(( .) 
REMARKS. 
1821. 
Apr. 8 
h. m. s. 
7.IO.58 
h. m. s. 
2.34.16 
0/1/ 
7.51.49 
10 p 3 Eridani (4) 
h. m. s. 
21.14,5 
/ II 
26.26 N 
Clear night. Land breeze, which 
gave the telescope a slight tremu- 
lous motion. 
1 1 
6.54.45 
2.46.29 
7-12. 2 
20 t Orionis (4) 
2.22.26,8 
9.20 s 
Clear still night. Circumstances fa- 
vourable. 
12 
7. 2.30 
2.50.14,6 6.58.39 
2.18.41,7 
4- 3 N 
Circumstances favourable. 
6.54.00 
2.57.14,9 
6-33-45 
380 Eridani (4) 
i- 5-53,3 
44.48,6 N 
Comet very faint ; but nucleus dis- 
tinct in the telescope. Circum- 
stances favourable. 
*7 
7.00.29 
3. 6.43,1 
5.58.11 
17 Eridani (4,5) 
1 5 • 1,9 
16.34,9 s 
Comet almost obliterated to the 
naked eye by the moon’s light. 
The observations however are 
good this evening. 
18 
6.36.52 
3. 9.32,1 
5.46.17 
12.13,0 
4.40,8 S 
All circumstances favourable. 
19 
6.34.54 
3.12.26,0 
5-34- 1 
9.19,0 
7-34,7 N 
Comet very faint — weather hazy, 
with a fresh breeze, which gave a 
tremulous motion to the telescope. 
Circumstances not favourable. 
20 
6.28.19 
3.15. 8,0 
5.23.58 
6.37,1 
17.38,3 N 
All circumstances favourable, al- 
though the Comet appeared rather 
fainter than usual. 
21 
6.30.10 
3.17.46,4 
5-*3- 32,7 
3.58,6 
28. 3,3 N 
All circumstances very favourable. 
24 
6.49-3° 
3-25-14,4 
4.45. 1 8,3 
42! Eridani (3,4) 
49.32,6 
35.26,3 S 
Circumstances all favourable. Co- 
met very faint. 
29 
6.48.36 
3-36-29,2 
3-S7-46,8 
38.17,8 
12. 5,2 N 
Circumstances all favourable, but 
Comet fainter. 
May 1 
6.31.40 
3-4 0 - i 5>8 
3.41.15,9 
48 v Eridani (4) 
47- 7,7 
2.10,4 N 
Circumstances very favourable. Co- 
met very distinct. 
3 
6.29.37 
3.44.20,4 
3-25-53, 1 
43- 3,i 
17.33,2 N 
Circumstances favourable — but the 
Comet very faint. This was the 
last observation made. 
