[ 409 ] 
Obfervations of the Eclipfcs of Jupiter’s Satellites, with refleding Tele- 
fcopes of 2 Feet Focus, and the Longitude of the Obfervatory thence 
deduced. 
1769 
Time 
clock 
jer 
Apparent time 
cor. 
h 
/ 
// 
h ' K 
May 
10 
10 
02 
30 
i6 11 I 
16 
03 
3C 
Capt. Cook 
16 
12 
I 
12 
10 
27 
55 
10 37 6 
10 
28 
05 
Capt. Cook 
10 
37 
16 
27 
1 1 
1 1 
44 
44 
04 
05 
II 57 39 ' 
Capt. Cook 
II 57 40 
pverv clear 
1 1 
47 
15 
12 00 51 
44 
1 1 
48 
08 
Capt. Cook^ 
1 2 
I 
June 
4 
TO 
41 
19 
10 45 31 
10 
41 
28 
Capt. Cook 
10 
45 
40 
7 
02 
45 
7 08 19 
7 
02 
45 
Capt. Cook 
7 
8 
16 
18 
27 
21 
14 33 36 
H 
28 
09 
Capt. Cook 
14 
34 
24 
20 
8 
55 
15 
9 I 43 
2J 
8 
46 
45 
8 53 22 
8 
47 
44 
Capt. Cook 
8 
54 
21 
July 
27 
10 
48 
45 
10 56 15 
4 
12 
42 
40 
12 51 16 
6 
7 
09 
20 
7 18 16 
7 
09 
25 
Capt. Cook 
7 
18 
21 
Phenomena and Sat. 
Emerf. of the ifl; Sat. 
Ditto 
Second Satellite 
Third ditto 
Firft ditto 
Ditto 
Ditto 
Ditto 
Second Satellite 
Firft ditto 
Ditto 
Ditto 
Time at Green, 
per Naut. Aim. 
Long. W. of Green, 
in time 
20 44 39 
9 59 4 
17 6 31 
9 58 14 
24 31 4* 
9 57 41 
19 0 2 
9 58 19 
20 ^3 43 
22 47 33 
17 16 05 
9 57 28 
9 56 17 
9 57 47 
Eclipfe of the Moon. 
June 18 8 
CO 
5 
8 
24 
M 
00 
II 
52 
30 
1 1 
58 
44 
1 1 
52 
10 
1 1 
58 
24 
II 
55 
37 
12 
I 
48 
11 
55 
10 
12 
I 
21 
Beginning of the eclipfe 
End of the eclipfe 
Ditto by Capt. Cook 
The D clear of the penumbra 
Ditto by Capt. Cook. 
Mean of the feven obfervations of 
the firft Satellite, rejefting thofe of 
the loth and 12th of May, as too 
near Jupiter’s oppofition to the Sun, 
gives the longitude of Venus’s Fort 
9*' 57' 50"= 149° 27' 30". Add 
20" for the correftion of the times in 
the nautical almanack, as found by 
the obfervations of March 29 and 
April 12, at Greenwich, the true 
longitude will be 9** 58' 10"= 
149° 32' 30". 
Ggg 
VoL. LXI. 
Tranfit 
