i ^ss ) 
fhadow. And again, IJoveml, 14 following, 6^-10^ 5*5^ 
app, Time^ but 6^*5/, 55''. ^q,T. he obferved the iike 
Emerfien of the fame Satellite. The obferved interval 
of Time between theft Emerfions was 43^*o^'6'. i8'^ 
which is 8^ 22'^ more than 6 mean Revolutions of this 
Satellite^ of which 4'. 2 7''. arifes from the difference of 
the firft Equations and the greater continuance of the 
latter Eclipfe ; fo that the other 4 Minutes is all that is 
left toanfwer for the difference ot thefecond iEquations; 
and Num. II. in that time increafiog from 48 to yxjgives 
4^ 36''. for the difference of the fecond ^Equations of the 
Ftrft Satellite. So that here the fecond Equation of the 
third is found rather lefs than that of the Firft ^ but the 
difference is fo fmall, that it may rather be attributed to 
the oocertajntj?' of Obfervation. Whereas according to 
MonfieurC^^»/s Method of Calculating, inftead of four 
Minutes it ought to be 18'. 38'^and the Interval of thefe 
tw^o Emerfions 43^ 0^ x1'. exceeding the Time obferved 
by a whole quarter of an hour^ which that Curious 
Obftrver could not be deceived in. 
The like appears yet more evidently in the Ff?^^;'/^ 
Satellite, By the Obfervation of- Mr. Flamfteed at Green- 
wich, Anno i6%z. Sept, X4°- 17^' 45'. T. app. but 17^- 
3x^^T.2Eq. thQ Fourth Satellite feen newly come 
out of the ihadow, fo that about 17^'- 30'. T. seq. the 
firft beginning of Emerfion was conje£lured ; and after 
five Revolutions, viz, Decemh, 17^- ii^- 16'. or ii^* 18'. 
T. 2eq. he again obferved the firft appearance of the Sa-^ 
tellite beginning to Emerge, that is, after an Interval of 
8^d. j^h.^g/. vi^hereas this Satellite m^kcs five mean 
Revolutions in 8 3 1 8^- x y ' |. Here we have 3 7 ' f to be 
accounted for by the feveral Inequalities. Of this 21^ is 
due to the firft /Equations, which is reduced to 19' by 
the greater continuance of the latter Eclipfe, Jupiter then 
'Approaching to his defcendiog Node : So that there re- 
mains only i8' y for the difference of the Second ^Equa- 
Q^q z tionSj 
