( pOl ) 
to the Eafl of Jupiter \ the firfl: ( as flfoteraidi ) having 
lately emerged out of the Shadow ; the fecond being 
almod at its greacell didance; and the third having 
pafled the Axis of the Shade about twelve Hours be- 
fore, and appearing at this time about three Diame- 
ters of Jupiter from his Limb. The times that thefe 
Spots arrived at the middle of the Difque are agreeable 
to the times found by Calculation , in which the 
fourth Satellite and its Shade ought to have appear* 
ed there. From all which ’tis very plain, that the 
fird of thefe Spots was the fourth Satellite itfelf, and 
the fecond its Shadow# 
We have feen the fird and fecond Satellites ap- 
pearing not as dark Spots but as bright ones Cfomewhac 
different from the light of Jupiter') for fome little 
time after they entred his Dilque, but as they ap- 
proached nearer the Middle we lod fight of them. 
And we have frequently obferved that the fame Sa- 
tellites appear brighter at fbme times than at others; 
and that when one of them hath diined with its ut- 
mod Splendour, the Light of another hath been con- 
fiderably diminifhed. From whence ’tis very probable 
at lead, not only that the Satellites revolve upon their 
proper Axes, but alfo that fome parts of their Sur* 
ftces do very faintly ( if at all ) refletd the Solar 
Rays to us. 
All which hath for fome time fince been obferved 
and taken notice of by MefT. CaJJini and MiraleH, as 
may be feen in the Metnom of the Academie Bojale, 
for the Years 1707 and 1714. 
