[ 5°2 ] 
XL I. Obfervations of Immerjions and Emerjions of Jupiter’s 
frft Satellite , made at Funchal, in Madeira, with a re - 
fieSling 'Tel ef cope of 1 8 Inches Focus , by Mr, Short. 
The Time was found by. taking equal Altitudes , with a 
Quadrant of i 2 Inches radius , Mr. Bird, M//; 
//’£? help oj a good Pendulum Clock made in London. By 
the late Thomas Heberden, M.D. F.R.S. 
Read Dec. 13, 1770. 
THE latitude of the place of obfervation in Funchal, by a mean of feveral obferrations made 
with the fame quadrant 22: 32 0 33' 35". 
Obfervations of Jupiter’s firft Satellite, 
made at Madeira. 
Magnif. 
power 
1763 
Dec. 26 
1764 
Jan. n 
25 
Feb. 10 
17 
Mar. 27 
1765 
Dec. 24 
1766 
Jan. 16 
Feb. 1 
Mar. 5 
1767 
Apr. 16 
May 9 
95 
95 
95 
55 
55 
55 
55 
55 
55 
55 
55 
Apparent time 
Emerfions. 
h / // 
7 16 4 
5 27 35 hazy 
9 12 42 
7 29 47 
9 25 1 2 flying clouds 
893 clouds 
Immerfions. 
o 3 1 20 
7 44 38 
Emerfions. 
6 37 36 doubtful 
8 9 48 
8 2 $ 35 flying clouds 
Obfer. made at 
Greenwich with 
a reflector of fix 
feet focus, pow- 
er 100 
10 39 27 
Q l6 12 
9 32 26 
Calculated in t 
Diff. 
of 
Mer. 
the Connoif- 
between Madei- 
fance 
des 
ra and Green- 
temps. 
wich 
h 
r tr 
b 
f 
lr 
8 
3 1 47 
1 
6 
27 
6 
42 55 
1 
6 
4 
10 
28 24 
1 
6 
26 
8 
45 34 
1 
6 
3 i 
10 
41 3 
1 
6 
35 
9 
24 48 
1 
6 
29 
10 
47 48 
1 
7 
12 
9 
0 43 
1 
6 
49 
7 
53 28 
1 
6 
36 
Calculated in 
the Naut. Aim. 
9 
16 55 
1 
7 
7 
9 
33 12 
1 
7 
37 
Obfervationt 
