Galilei, Galileo
,
The systems of the world
,
1661
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from this to the other yet bigger of
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Saturn,
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whoſe period is of
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thirty years, it is neceſſary, I ſay, that you paſſe to another
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Sphere incomparably greater ſtill than that, and make this to
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compliſh an entire revolution in twenty four hours. </
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<
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>And this yet is
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the leaſt diſorder that can follow. </
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<
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>For if any one ſhould paſſe
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from the Sphere of
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Saturn
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to the Starry Orb, and make it ſo
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much bigger than that of
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Saturn,
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as proportion would require, in
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reſpect of its very ſlow motion, of many thouſands of years, then
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it muſt needs be a
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Salt
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much more abſurd, to skip from this to
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another bigger, and to make it convertible in twenty four hours.
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>But the motion of the Earth being granted, the order of the
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riods will be exactly obſerved, and from the very ſlow Sphere of
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Saturn,
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we come to the fixed Stars, which are wholly
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ble, and ſo avoid a fourth difficulty, which we muſt of neceſſity
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mit, if the Starry Sphere be ſuppoſed moveable, and that is the
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immenſe diſparity between the motions of thoſe ſtars themſelves;
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of which ſome would come to move moſt ſwiftly in moſt vaſt
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cles, others moſt ſlowly in circles very ſmall, according as thoſe
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or theſe ſhould be found nearer, or more remote from the Poles;
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which ſtill is accompanied with an inconvenience, as well becauſe
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we ſee thoſe, of whoſe motion there is no queſtion to be made,
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to move all in very immenſe circles; as alſo, becauſe it ſeems to
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be an act done with no good conſideration, to conſtitute bodies,
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that are deſigned to move circularly, at immenſe diſtances from
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the centre, and afterwards to make them move in very ſmall
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cles. </
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<
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>And not onely the magnitudes of the circles, and
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quently the velocity of the motions of theſe Stars, ſhall be moſt
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different from the circles and motions of thoſe others, but
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(which ſhall be the fifth inconvenience) the ſelf-ſame Stars
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ſhall ſucceſſively vary its circles and velocities: For that
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thoſe, which two thouſand years ſince were in the Equinoctial,
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and conſequently did with their motion deſcribe very vaſt
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cles, being in our dayes many degrees diſtant from thence, muſt
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of neceſſity become more ſlow of motion, and be reduced to
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move in leſſer circles, and it is not altogether impoſſible but that
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a time may come, in which ſome of them which in aforetime had
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continually moved, ſhall be reduced by uniting with the Pole, to
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a ſtate of reſt, and then after ſome time of ceſſation, ſhall return
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to their motion again; whereas the other Stars, touching whoſe
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motion none ſtand in doubt, do all deſcribe, as hath been ſaid,
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the great circle of their Orb, and in that maintain themſelves
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without any variation. </
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<
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>The abſurdity is farther enlarged (which
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let be the ſixth inconvenience) to him that more ſeriouſly
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neth the thing, in that no thought can comprehend what ought to
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be the ſolidity of that immenſe Sphere, whoſe depth ſo ſtedfaſtly </
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