_Jupiter_ must have bin. But having been since informed of _all_ the
_Observations_ made by _Cassini_ and _Campani_, with the _New_ Glasses, and
seen his _Figure_, he candidly and publickly wisheth, that he had not
spoken of that _Sally_, or _Prominency_; advowing that he can doubt no
longer, but that it was the _shadow_ of the _Satellit_ between _Jupiter_
and the _Sun_, having seen the other emerge, as soon as with a 20. foot
Glass he made the Observation, and having not perceiv'd these _shadows_
with a 12. foot Glass: But although he grants that they did ghess better
than he, yet he doth it with this _proviso_, _vid._ in case they made
_that_ Observation on of _July_ 30. not with their 36. but 12. or 17. foot
_Telescope_. If it be wondred at, that Monsieur _Auzout_ did not see this
_shadow_ move, he allegeth his indisposition for making _long
Observations_, and addeth, that it may be much more wondred at, that
neither _Campani_ nor himself did see upon the obscure _Belt_ the Bodies of
the _Satellites_, as parts more Luminous than the _Belt_. For (saith he)
although the _Latitude_ was _Meridional_, it being no more than of 9. or
10. minutes, the Body of the _Satellites_ should, thinks he, pass between
_us_ and the _Belt_, especially according to _Campani_, who maketh the
_Belt_ so large, and puts the _shadows_ farr enough within the same. This
maketh him conclude, that either they have not observed well enough, or
that the motion of the _Satellites_ doth not exactly follow the _Belts_,
and is inclin'd unto them. Whereupon he resolves, that when he shall know
that they are to pass between _Jupiter_ and _us_, and to be over against
the _Belt_, that {74} then he will observe, whether he can see them appear
upon the _Belt_, as upon a darker ground, especially, the _third_ of them,
which is sensibly greater, and more Luminous, than the rest. He hopeth
also, that in time, the _shadow_ of _Saturns Moon_ will be seen upon
_Saturn_, although we are yet some years to stay for it, and to prepare
also for better Glasses.

From this rare Observation, he inferrs the _Proportion_ of the _Diameter_
of the _Satellites_ to that of _Jupiter_; and judgeth, that no longer doubt
can be made of the turning of these 4. _Satellites_, or _Moons_ about
_Jupiter_, as our _Moon_ turns about the _Earth_, and after the same way as
the rest of the Celestial Bodies of our _Systeme_ do move: whence also a
strong conjecture may be made, that _Saturns_ Moo