Galilei, Galileo, The systems of the world, 1661

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SIMPL. That diſpoſition is not new, but very old, and that
you
may ſee it is ſo, Ariſtotle confuteth it; and his confutations
are
theſe: “Firſt if the Earth moveth either in it felf about its

own
Centre, or in an Excentrick Circle, it is neceſſary that that
ſame
motion be violent; for it is not its natural motion, for
if
it were, each of its parts would partake thereof; but each
of
them moveth in a right line towards its Centre.
It being
therefore
violent and pteternatural, it could never be
al
: But the order of the World is perpetual.
Therefore, &c.
Secondly
, all the other moveables that move circularly, ſeem
to
^{*} ſtay behind, and to move with more than one motion, the

Primum Mobile excepted: Whence it would be neceſſary that
the
Earth alſo do move with two motions; and if that ſhould
be
ſo, it would inevitably follow, that mutations ſhould be
made
in the Fixed Stars, the which none do perceive; nay
without
any variation, the ſame Stars alwayes riſe from towards
the
ſame places, and in the ſame places do ſet.
Thirdly, the
tion
of the parts is the ſame with that of the whole, and
ly
tendeth towards the Centre of the Univerſe; and for the ſame
cauſe
reſt, being arrived thither.
He thereupon moves the
ſtion
whether the motion of the parts hath a tendency to the
centre
of the Univerſe, or to the centre of the Earth; and
deth
that it goeth by proper inſtinct to the centre of the Univerſe,
and
per accidence to that of the Earth; of which point we largely
diſcourſed
yeſterday.
He laſtly confirmeth the ſame with a fourth
argument
taken from the experiment of grave bodies, which
ing
from on high, deſcend perpendicularly unto the Earthsſurface;
and
in the ſame manner Projections ſhot perpendicularly upwards,
do
by the ſame lines return perpendicularly down again, though
they
were ſhot to a very great height.
All which arguments
ſarily
prove their motion to be towards the Centre of the Earth,
which
without moving at all waits for, and receiveth them.
He
intimateth
in the laſt place that the Aſtronomers alledg other
reaſons
in confirmation of the ſame concluſions, I mean of the
Earths
being in the Centre of the Univerſe, and immoveable;
and
inſtanceth onely in one of them, to wit, that all the
nomena
or appearances that are ſeen in the motions of the Stars,
perfectly
agree with the poſition of the Earth in the Centre;
which
would not be ſo, were the Earth ſeated otherwiſe.
The reſt produced by Ptolomy and the other Aſtronomers, I can
give
you now if you pleaſe, or after you have ſpoken what you
have
to ſay in anſwer to theſe of Ariſtotle.
Ariſtotles
guments
for the
Earths
quieſſence.

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