t 
{ t034 ) 
1710. 
D. h. ' '' Nu.A. 
o. 20. X2. . 40 95 ^ 
4 . 13. /}4 . 22 Bifs. 22 
Conj. Me^. 5 . 10 • 07 . Oi 97 ^ 
^quac. f. 44 • ^ J 
j'T.quat II.. O' 45" 
j^quat. Hf. 3 • '9‘ 
1 . 5 . 40 SemUar. Add* 
April 5 . 12 . 01. 09 
Na.B. 
yiQ 
244 
1 ? JEq B. 
567 B. Aiquar. 
Hence it appears that at one Minute after Mid- 
night following the fifth of ril, equal l ime, will 
happen the Emerfion rcquiied Nor do we doubt 
but that the Event will very nearly anfwer. 
LaBly, it may not be amif^ here to inform the R^aS- 
der, that we have learnt, by the experience of many 
Years Obfervation, that the iecorid inequality of this 
Satellite proceeds from the progrelTive Propagation of 
Light, and is common to all the fed of the Satellites: 
Light being foUnd to proceed in about feven Minutes 
of time as far as from the Sun to thu Earth, whether 
with an equable motion or ocher Wife iS ftlH a'^efli'on* 
For this reafon we have added a Third j/^qitation, 
whereby to account for the greater diflance of Jnpiter 
from the Earth in /iphetio dhan in faAhxtro^ as the 
Second ^Equation anfwerS to the greater diftance of the 
Planet when near the Conjundlion of the Sail, than 
when near his Oppofition- 
F / N I 
JLondoni Printed by W. and J. Innys, Printers to the 
Ro)al Society, at the Princes-Arms at the Wed Corner 
of St. Qiurch-Yard. 1719. 
