162 
. t f 1 771 
From the ephemeris the aberration was computed, and also a 
table of thecomet's laily motion, including second differences. Instead 
of interpolating to the traction of a day for each observation, the 
corrections were applied with a contrary sign to the observations 
themselves, and thus all were reduced to Paris midnight. The cor- 
rections for parallax, precession and nutation, all small, were applied, 
and the comparison stars where known were reduced from the B. A. C. 
to Jan. 1st, 1771. Several places used by Messier were found to be 
incorrect by 1 and 2 . The observations thus corrected did not 
agree together as well as before, indicating that they may have been 
somewhat altered to create uniformity. 
In the following list, the first column denotes the place of observa- 
tion. P. -rands for Paris ; G. Greenwich ; S. Stockholm ; R. Rouen ; 
M. Marseilles: K. Kremsmunster. The second denotes the local time 
of observation reduced to Paris. The fourth and fifth are the obser- 
vations corrected for precession, nutation and parallax, and reduced 
to midnight of Paris mean time. 
37U. 
Paid* m. t- 
Aber. 
Reduced to uuduigrbt. 
Paris m. t. 
c-o 
1 
wt.. 
Star. 
Obs. 
a. 
Obf. 
A a j Ad 
fa 
m 
f ni 
F 
• 
0 
** 
* 
** 1 «* 
p 
Apr. 
1 
8 
__ 
40 13 
50 
36 
5€ 
50-6 
20 
21 
24-6 
— 
3 
4-4 -1 
57"6 
5 
a b 
li 
U 
2 
7 
33 
32 
4- 
40 
0 
5"9 
47 
4*5 
— 
2 
13-4—1 
34-8 
5 
be 
u 
u 
3 
7 
42 
30 
45 
41 
4 
55‘1 
21 
12 
56*9 
— 
59-1 -1 
33-3 
3 
c 
u 
id 
4 
8 
0 
30 
41 
42 
10 
4-2 
36 
23-1 
— 
1 
1-9—1 
15.6 
5 
\c 
■u 
<u 
5 
8 
3 
49 1 
37 
43 
16 
19-7 
22 
4 
252 
— 
2 
7*7—3 
44-9 
1 3 
c ef 
<u 
“ 
6 
51 
43 
33 
44 
26 
37-6 
29 
34-3 
— 
4 
14-5—1 
34-6 
3 
df 
u 
da 
7 
51 
26 
O'S 
45 
37 
19-4 
55 
335 
— 
3 
40*2—1 
29-9 
5 
df 
*1 
it 
8 
7 
50 
23 
22 
46 
46 
59-5 
23 
20 
13-4 
1 — 
1 
59-6 -2 
23-0 
5 
df 
u 
u 
9 
7 
51 
23 
17 
47 
56 
22*1 
44 
5-8 
— 
2 
■ ‘ : 
47-0 
5 
df h 
*4 
Jk 
10 
7 
53 
56 
11 
49 
10 
46-7 
24 
8 
14-5 
I— 
2 
47-4 — 1 
48-1 
5 
dfh 
da 
u 
11 
8 
6 
30 
7 
50 
24 
9-0 
32 
1-4 
— 
2 
— 1 
41-8 
5 
df g h 
I u 
u 
12 
8 
17 
46 
4 
51 
36 
44-6 
55 
12-1 
— 
2 
19*9-1 
39-9 
6 
fg 
B 
aa 
12 
8 
58 
14 
4 
39 
52- 
51 
59-2 
— 
3 
. ‘ 4 1 
330 
2 
P 
“ 
13 
7 
52 
50 12 
om 
v*> 
53 
36-7 
25 
16 
34-4 
— 
1 
1 - -- 
8-5 
4 
g h 
B 
Id 
13 
8 
21 
53 
5*- 
56 
9-5 
16 
35- 
— 
3 
52-6 —2 
9-5 
2 
P 
id 
14 
8 
4 
20 1 
53 
54 
9 
5-3 
39 
52-1 
+ 
9-3 -1 
1-4 
4 
h 
G 
•* 
14 
9 
22 
55 
53 
11 
33-6 
40 
15-2 
— 
2 
19-2 — 1 
24-5 
6 
i 
E 
U 
14 
8 
10 
39 
53 
13 
10-6 
40 
36 9 
— 
3 
56 2 —1 
46-2 
2 
P 
u 
15 
8 
12 
46 
49 
55 
29 
38-9 
1 
535 
— 
2 
21-4 -1 
90 
3 
h l 
B 
a 
15 
8 
2 1 
0 
49 
30 
57* 
2 
46- 
— 
3 
40- —2 
4- 
2 
G 
u 
15 
8 
56 
30 
49 
29 
42-9 
2 
23-5 
— 
2 
254—1 
391 
5 
k 
P 
da 
16 
8 
14 
51 
45 
56 
46 
12-4 
22 
41 
— 
1 
47*5 — 
0-6 
2 
h 
B 
da 
16 
8 
27 
56 
45 
49 
2*2 
22 
54-6 
— 
3 
7* — 
50- 
2 
P 
id 
17 
8 
15 
2i 
41 
56 
9 
43- 
44 
53 '6 
— 
3 
6-4 —2 
4-3 
5 
hi n 0 
R 
da 
n 
8 
10 
21 
41 
10 
14- 
42 
10- I 
— 
3 
36- 4 
39- 
2 
G 
di 
17 
9 
2 
15 
41 
9 
56-0 
44 
54-5 
— 
3 
21-4 —2 
5-2 
i i 
l 
P 
da 
18 
8 
20 
13 
39 
59 
30 
27 
3 
56*2 
— 
2 
12-1 -1 
0-1 ! 
3 
l no 
B 
u 
18 
8 
6 
27 
39 
31 
36- 
2 
55* 
— 
3 
47- 4 
1- 
2 
G 
%& 
18 
8 
46 
35' 
391 
31 
12- 
4 
41-7 
— 
3 
2 4—1 
45-6, 
6 
0 
U , 
dd 
18 
9 
2 
20 
39 
31 
9-2 
4 
34-6 
— 
3 
17-6 —1 
38-7 
5 
V 
g 
“ 
19 
10 
56 
41 
36 
60 
46 
47* 
24 33- 
— 
3 
22- 2 
10- 
1 
0 
da 
dd 
21 
11 
3 
42 
30 
63 
33 
39- 
56 
36- ; 
4 
2- -1 
44- 
1 
m 
G 
01 
21 
9 
12 
0 
so! 
40 
56-1 
28 
1 
21-2 
— 
3 
11-0 -2 
140 
7 
P 
M 
dd 
22 
8 
16 
23 
26 
64 
59 
46- 
17 
49- 
4 
3 
19- —1 
29- 
0 
g 
u 
22 
11 
56 
42 
26 
65 
6 
53. J 
17 
31- IJ 
— 
3 
48- 1 — 1 
11 - 
1 
r 
