Galilei, Galileo
,
The systems of the world
,
1661
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the laſt place, thoſe, by which others may be perſwaded, that the
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Earth is no leſs than the Moon, or any other Planet to be
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bered amongſt natural bodies that move circularly.</
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<
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>SAGR. </
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>I ſhall the more willingly incline to this, in that I am
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better ſatisfied with your Architectonical and general diſcourſe,
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than with that of
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Ariſtotle,
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for yours convinceth me without the
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leaſt ſcruple, and the other at every ſtep croſſeth my way with
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ſome block. </
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<
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>And I ſee no reaſon why
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Simplicius
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ſhould not be
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preſently ſatisfied with the Argument you alledg, to prove that
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there can be no ſuch thing in nature as a motion by a right line,
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if we do but preſuppoſe that the parts of the Univerſe are
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ſed in an excellent conſtitution and perfect order.</
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<
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>SALV. </
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<
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>Stay a little, good
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Sagredus,
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for juſt now a way comes
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into my mind, how I may give
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Simplicius
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ſatisfaction, provided
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that he will not be ſo ſtrictly wedded to every expreſſion of
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riſtotle,
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as to hold it hereſie to recede in any thing from him. </
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<
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>Nor
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is there any queſtion to be made, but that if we grant the
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lent diſpoſition and perfect order of the parts of the Univerſe,
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as to local ſcituation, that then there is no other but the circular
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motion, and reſt; for as to the motion by a right line, I ſee not
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how it can be of uſe for any thing, but to reduce to their natural
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conſtitution, ſome integral bodies, that by ſome accident were
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mov'd and ſeparated from their whole, as we ſaid above.</
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<
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>Let us now conſider the whole Terreſtrial Globe, and enquire
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the beſt we can, whether it, and the other Mundane bodies are to
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conſerve themſelves in their perfect and natural diſpoſition. </
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<
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>It
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is neceſſary to ſay, either that it reſts and keeps perpetually
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moveable in its place; or elſe that continuing always in its place,
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it revolves in its ſelf; or that it turneth about a Centre, moving
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by the circumference of a circle. </
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<
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>Of which accidents, both
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ſtotle
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and
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Ptolomey,
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and all their followers ſay, that it hath ever
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obſerved, and ſhall continually keep the firſt, that is, a perpetual
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reſt in the ſame place. </
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<
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>Now, why, I pray you, ought they not
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to have ſaid, that its natural affection is to reſt immoveable,
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ther than to make natural unto it the motion ^{*} downwards, with
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which motion it never did or ſhall move? </
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<
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>And as to the motion
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by a right line, they muſt grant us that Nature maketh uſe of it
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to reduce the ſmall parts of the Earth, Water, Air, Fire, and every
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other integral Mundane body to their
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Whole,
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when any of them
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by chance are ſeparated, and ſo tranſported out of their proper
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place; if alſo haply, ſome circular motion might not be found
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to be more convenient to make this reſtitution. </
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<
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>In my
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ment, this primary poſition anſwers much better, even according
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to
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Ariſtotles
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own method, to all the other conſequences, than
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to attribute the ſtraight motion to be an intrinſick and natural </
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