Galilei, Galileo, The systems of the world, 1661

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1without encompaſſing the Earth; about the ſame Sun you make
the three ſuperiour Planets Mars, Jupiter, and Saturn, to move,
comprehending the Earth within their circles.
The Moon in the
next place can move in no other manner than about the Earth,
without taking in the Sun, and in all theſe motions you agree alſo
with the ſame Copernicus. There remains now three things to be
decided between the Sun, the Earth, and fixed ſtars, namely,

Reſt, which ſeemeth to belong to the Earth; the annual motion
under the Zodiack, which appeareth to pertain to the Sun; and the
diurnal motion, which ſeems to belong to the Starry Sphere, and
to be by that imparted to all the reſt of the Univerſe, the Earth
excepted, And it being true that all the Orbs of the Planets, I

mean of Mercury, Venus, Mars, Jupiter, and Saturn, do move
about the Sun as their centre; reſt ſeemeth with ſo much more
reaſon to belong to the ſaid Sun, than to the Earth, in as much
as in a moveable Sphere, it is more reaſonable that the centre
ſtand ſtill, than any other place remote from the ſaid centre; to
the Earth therefore, which is conſtituted in the midſt of
able parts of the Univerſe, I mean between Venus and Mars, one
of which maketh its revolution in nine moneths, and the other in
two years, may the motion of a year very commodiouſly be

ſigned, leaving reſt to the Sun.
And if that be ſo, it followeth
of neceſſary conſequence, that likewiſe the diurnal motion
longeth to the Earth; for, if the Sun ſtanding ſtill, the Earth
ſhould not revolve about its ſelf, but have onely the annual
tion about the Sun, our year would be no other than one day and
one night, that is ſix moneths of day, and ſix moneths of night,
as hath already been ſaid.
You may conſider withal how
diouſly the precipitate motion of 24 hours is taken away from
the Univerſe, and the fixed ſtars that are ſo many Suns, are made
in conformity to our Sun to enjoy a perpetual reſt.
You ſee
over what facility one meets with in this rough draught to render
the reaſon of ſo great appearances in the Celeſtial bodies.
Reſt, the annual
motion and the
urnal ought to be
diſtributed
twixt the Sun,
Earth, and
mament.
In a moveable
ſphere, it ſeemeth
more veaſonable
that its centre be
ſtable, than any
ther of its parts.
Granting to the
Earth the annual,
it muſt of neceſſity
alſo have the
nal motion
ed to it.
SAGR. I very well perceive that facility, but as you from this
ſimplicity collect great probabilities for the truth of that Syſtem,
others haply could make thence contrary deductions; doubting,
not without reaſon, why that ſame being the ancient Syſteme of
Pythagoreans, and ſo well accommodated to the Phænomena,
hath in the ſucceſſion of ſo many thouſand years had ſo few
lowers, and hath been even by Ariſtotle himſelf refuted, and
ſince that Copernicus himſelf hath had no better fortune.
SALV. If you had at any time been aſſaulted, as I have been,
many and many a time, with the relation of ſuch kind of frivolous
reaſons, as ſerve to make the vulgar contumacious, and difficult to
be perſwaded to hearken, (I will not ſay to conſent) to this

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