[ 106 ] 
Jul. 
years 
cur- 
rent. 
Conj. 1 ft fat. 
D.H. ' " 
Num. 
A. 
Num. 
B. 
Num. 
c. 
Conj. 
D.H. 
2d fat. 
/ // 
Conj. 3d fat. 
D.H. / // 
Conj. 4th fat. 
D.H. / " 
1728 
0 21 58 16 
630 
651 
484 
0 21 
20 
0 
6 4 57 0 
2 3 25 0 
1748 
0 3 7 18 
316 
962 
175 
3 2 
32 
24 
3 18 7 54 
1 16 37 41 
1768 
1 2 44 57 
2 
278 
869 
x 18 
26 
54 
1 7 18 48 
1 5 50 22 
Number C is the period of 437 days (wherein the 
three innermoft fatellites return very nearly to the 
fame fituation in refpedt of one another, and of Ju- 
piter’s fhadow), in millefimals of a circle ; and muft 
be corre&ed by the equation of number B, under a 
contrary title. 
The fecond fatellite has a fynodical equation of 
16' or 17' in time (whofe revolution is in this period), 
to be fubtradled, if numb. C be lefs than yoo 3 added, 
if greater. The firft and third fatellites have alfo 
lmall fynodical equations (returning in the fame 
period), that of the fir ft fatellite being about 3', of 
the third about 2 in time ; both to be added, if 
numb. C be lefs than joo; fubtra&ed, if greater. 
The orbit of the third fatellite is manifeftly ex- 
centric, as well as that of the fourth. Its apojovium 
in 1728 was about io° of T, and moves forward 
35 0 in 20 years : its greateft equation is about 15' in 
the fatellite’s orbit, or 7' in time. 
The apojovium of the fourth fatellite in 1728, was 
in 12 0 30' of X, and moves forward about ia° in 
2.0 years: its greateft equation is 53' in the fatellite’s 
orbit, or 59' in time. 
I found no reafon to make any alteration in the 
femi-durations of the eclipfes of the firft fatellite 
from Mr. Pound’s tables. 
The 
