Galilei, Galileo
,
The systems of the world
,
1661
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would never with his walking have arrived, if the Ship with its
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motion had not wafted him thither.</
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A ſingle
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able hath but onely
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one natural
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on, and all the
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reſt are by
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pation.
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<
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>SAGR. </
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<
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>Tell me ſecondly. </
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<
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>That motion, which is
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cated to any moveable by participation, whileſt it moveth by it
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ſelf, with another motion different from the participated, is it
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neceſſary, that it do reſide in ſome certain ſubject by it ſelf, or
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elſe can it ſubſiſt in nature alone, without other ſupport.</
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<
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>SIMPL.
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Ariſtotle
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giveth you an anſwer to all theſe queſtions,
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and tels you, that as of one ſole moveable the motion is but one;
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ſo of one ſole motion the moveable is but one; and
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ly, that without the inherence in its ſubject, no motion can
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ther ſubſiſt, or be imagined.</
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Motion cannot
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be made without
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its moveable
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ject.
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<
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>SAGR. </
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<
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>I would have you tell me in the third place, whether
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you beblieve that the Moon and the other Planets and Cœleſtial
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bodies, have their proper motions, and what they are.</
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<
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>SIMPL. </
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<
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>They have ſo, and they be thoſe according to which
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they run through the Zodiack, the Moon in a Moneth, the Sun
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in a Year,
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Mars
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in two, the Starry Sphere in thoſe ſo many
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ſand. </
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<
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>And theſe are their proper, or natural motions.</
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<
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>SAGR. </
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<
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>But that motion wherewith I ſee the fixed Stars, and
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with them all the Planets go unitedly from Eaſt to Weſt, and
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turn round to the Eaſt again in twenty four hours, how doth it
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agree with them?</
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<
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>SIMPL. </
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<
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>It ſuiteth with them by participation.</
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<
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>SAGR. </
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<
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>This then reſides not in them, and not reſiding in
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them, nor being able to ſubſiſt without ſome ſubject in which it
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is reſident, it muſt of force be the proper and natural motion of
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ſome other Sphere.</
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<
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>SIMPL. </
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<
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>For this purpoſe Aſtronomers, and Philoſophers have
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found another high Sphere, above all the reſt, without Stars, to
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which Natural agreeth the Diurnal Motion; and this they call
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the
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Primum mobile
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; the which carrieth along with it all the
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feriour Spheres, contributing and imparting its motion to
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them.</
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<
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>SAGR. </
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<
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>But when, without introducing other Spheres unknown
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and hugely vaſt, without other motions or communicated raptures,
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with leaving to each Sphere its ſole and ſimple motion, without
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intermixing contrary motions, but making all turn one way, as
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it is neceſſary that they do, depending all upon one ſole principle,
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all things proceed orderly, and correſpond with moſt perfect
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mony, why do we reject this
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Phœnomenon,
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and give our aſſent to
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thoſe prodigious and laborious conditions?</
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<
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>SIMPL. </
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<
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>The difficulty lyeth in finding out this ſo natural and
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expeditious way.</
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