Galilei, Galileo, The systems of the world, 1661

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if 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 thou­
ſand Circular Motions, and by conſequence a thouſand Cen­
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 mo­
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 ab­
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 ſim­
plicity of the motion, is no longer dependent onely on the ſim­
plicity of the line.
Right motion, ſome­
times ſimple, ard
ſometimes mixt ac­
cording to Ariſt.

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