Galilei, Galileo, The systems of the world, 1661

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of natural bodies ſome are moveable by nature, and others immo­
veable; eſpecially having before defined Nature, to be the prin­
ciple of Motion and Reſt.
Finite and termi­
nate circular mo­
tions diſorder not
the parts of the
World.
Senſible experi­
ments are to be pre­
ferred before hu­
mane argument
tions.
SALV. The moſt that you can pretend from this your Diſ­
courſe, were it granted to be true, is that, like as the parts of the
Earth removed from the whole, namely, from the place where
they naturally reſt, that is in ſhort reduced to a depraved and diſ­
ordered diſpoſure, return to their place ſpontaneouſly, and there­
fore naturally in a right motion, (it being granted, that eadem
ſit ratio totius & partium) ſo it may be inferred, that the
Terreſtrial Globe removed violently from the place aſſigned

it by nature, it would return by a right line.
This, as I have
ſaid, is the moſt that can be granted you, and that onely for want
of examination; but he that ſhall with exactneſs reviſe theſe
things, will firſt deny, that the parts of the Earth, in returning to
its whole, move in a right line, and not by a circular or mixt; and
really you would have enough to do to demonſtrate the contra­
ry, as you ſhall plainly ſee in the anſwers to the particular reaſons
and experiments alledged by Ptolomey and Ariſtotle. Secondly,
If another ſhould ſay that the parts of the Earth, go not in their
motion towards the Centre of the World, but to unite with its
Whole, and that for that reaſon they naturally incline towards the
centre of the Terreſtrial Globe, by which inclination they con­
ſpire to form and preſerve it, what other All, or what other Centre
would you find for the World, to which the whole Terrene

Globe, being thence removed, would ſeek to return, that ſo the
reaſon of the Whole might be like to that of its parts? It may be
added, That neither Ariſtotle, nor you can ever prove, that the
Earth de facto is in the centre of the Univerſe; but if any Centre

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