Galilei, Galileo, Discourse concerning the natation of bodies, 1663

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1and future, eſpecially if the time be for many Moneths or Years; I
am
therefore forced, with other Obſervations, and more exact than
the
former, and in times more remote from one another, to correct
the
Tables of ſuch Motions, and limit them even to the ſhorteſt
ment
: for ſuch exactneſſe my firſt Obſervations ſuffice not; not only
in
regard of the ſhort intervals of Time, but becauſe I had not as then
found
out a way to meaſure the diſtances between the ſaid Planets
by
any Inſtrument: I Obſerved ſuch Intervals with ſimple relation
to
the Diameter of the Body of Jupiter; taken, as we have ſaid, by
the
eye, the which, though they admit not errors of above a Minute,
yet
they ſuffice not for the determination of the exact greatneſs of the
Spheres
of thoſe Stars.
But now that I have hit upon a way of
king
ſuch meaſures without failing, ſcarce in a very few Seconds, I will
continue
the obſervation to the very occultation of JVPITER,
which
ſhall ſerve to bring us to the perfect knowledge of the
ons
, and Magnitudes of the Orbes of the ſaid Planets, together

alſo
with ſome other conſequences thence ariſing.
I adde to theſe
things
the obſervation of ſome obſcure Spots, which are
ed
in the Solar Body, which changing, poſition in that, propounds
to
our conſideration a great argument either that the Sun revolves in
it
ſelfe, or that perhaps other Starts, in like manner as Venus and
Mercury, revolve about it, inviſible in other times, by reaſon of their
ſmall
digreſſions, leſſe than that of Mercury, and only viſible when
they
interpoſe between the Sun and our eye, or elſe hint the truth
of
both this and that; the certainty of which things ought not to be
contemned
, nor omitted.

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