Galilei, Galileo, The systems of the world, 1661

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1if not ſo, then the ſuppoſion of Ariſtotle is defective. It appears

moreover
that Ariſtotle hinteth but one circular motion alone to
be
in the World, and conſequently but one onely Center, to
which
alone the motions of upwards and downwards, refer.
All
which
are apparent proofs, that Ariſtotles aim is, to make white
black
, and to accommodate Architectur to the building, and not
to
modle the building according to the precepts of Arthitecture:
for
if I ſhould ſay that Nature in Univerſal may have a
ſand
Circular Motions, and by conſequence a thouſand
ters
, there would be alſo a thouſand motions upwards, and
downwards
.
Again he makes as hath been ſaid, a ſimple motion,
and
a mixt motion, calling ſimple, the circular and right; and
mixt
, the compound of them two: of natural bodies he calls ſome
ſimple
(namely thoſe that have a natural principle to ſimple
tion
) and others compound: and ſimple motions he attributes
to
ſimple bodies, and the compounded to the compound; but by
compound
motion he doth no longer underſtand the mixt of right
and
circular, which may be in the World; but introduceth a mixt
motion
as impoſſible, as it is impoſſible to mixe oppoſite motions
made
in the ſame right line, ſo as to produce from them a motion
partly
upwards, partly downwards; and, to moderate ſuch an
ſurdity
, and impoſſibility, he aſſerts that ſuch mixt bodies move

according
to the ſimple part predominant: which neceſſitates
others
to ſay, that even the motion made by the ſame right line is
ſometimes
ſimple, and ſometimes alſo compound: ſo that the
plicity
of the motion, is no longer dependent onely on the
plicity
of the line.

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