[ 3°4 ] 
Table of Ecllpfes of Jupiter’s Satellites, obferved at Norriton,; 
compared with the calculated times of the lame Eclipfes for 
Greenwich, in order to fix the longitude of the Norriton obfer- 
vatory. N. B. If the oblerved times of fuch ot thofe Eclipfes 
as have been feen at Greenwich fhould differ from the calcu- 
lated times, the following difference of longitude, thence de- 
duced, muft be corrected accordingly. 
ill fatellite. Tmmerlions at Norriton. 
apparent time. 
Calculated apparent time of the 
fame for Greenwich. 
Long.ofNorrlton 
well of Greenwich 
thence deduced. 
1769. Day. 
h > n 
Day. 
h / // 
h 
/ // 
f'eb. 
16 
1421 10 
— 
Feb. 
16 
19 22 29 
5 
I 19 
i\pril 
23 
16 I 
— 
April 
23 
21 16 3^ 
- - 5 
1 34 
3 
14 49 25 

3 
19 51 24 - 
5 
I 59 
10 
16 46 0 
— 
10 
21 47 14 - 
“ - 5 
I 14 
12 
11 14 39 
— - ~ — 
1 2 
16 16 13 
5 
1 34 
May 
S 
II 29 27 
— 
May 
5 
16 31 20 
s 
I S 3 
Emerfionf. 
Emerfions. 
2 1 
11 55 13 
— 
2 1 
16 56 49 
s 
1 36 
June 
6 
10 II 32 
— - - — 
June 
6 
15 12 59 
- “ 5 
I 27 
13 
125 I 
— — - — 
^3 
17 6 31 
5 
I 30 
Difference of longitude from a mean of the above 9 ccHpfes 5 i 34 
3d fatellite, at Norriton ; apparent 
time. 
Day. 
June 2^ 
July 2 
h / /' 
8 51 33 Emerfion 
II 15 36 Immerfion 
Calculated time 
for Greenwich. 
h r 'I 
13 58 34 
16 12 zg 
Mean diff. of longitude 
Hence diff. 
of long, 
h / n 
5 7 I 
4 56 S 3 
5 I 57 
N. B. As the emerfion happened fo much fooner, and the im- 
merlion later, than the time given by the Tables, it is concluded, 
that the fatellite did not dip fo deep in“the ffadow as the Tables 
would have it ; but the mean of both gives nearly the fame differ- 
ence of longitude as the firft fatellite. 
“ May 
