Galilei, Galileo
,
The systems of the world
,
1661
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<
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>SAGR. </
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<
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>Hold a little, I pray you. </
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<
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>Tell me
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Simplicius,
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when
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two Knights encounter each other, tilting in open field, or when
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two whole Squadrons, or two Fleets at Sea, make up to grapple,
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and are broken and ſunk, do you call theſe encounters contrary to
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one another?</
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<
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>SIMPL. Yes, we ſay they are contrary.</
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</
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<
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>SAGR. </
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<
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>How then, is there no contrariety in circular motions.
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</
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<
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>Theſe motions, being made upon the ſuperſicies of the Earth or
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Water, which are, as you know, ſpherical, come to be circular.
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</
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<
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>Can you tell,
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Simplicius,
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which thoſe circular motions be, that
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are not contrary to each other? </
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<
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>They are (if I miſtake not) thoſe
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of two circles, which touching one another without, one thereof
<
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being turn'd round, naturally maketh the other move the
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ry ^{*} way; but if one of them ſhall be within the other, it is
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poſſible that their motion being made towards different points,
<
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they ſhould not juſtle one another.</
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As you ſee in a
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Mill, wherein the
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implicated cogs ſet
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the wheels on
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ving.</
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<
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>SALV. </
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<
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>But be they contrary, or not contrary, theſe are but
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alterations of words; and I know, that upon the matter, it would
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be far more proper and agreeable with Nature, if we could ſalve
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all with one motion onely, than to introduce two that are (if you
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will not call them contrary) oppoſite; yet do I not cenſure this
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introduction (of contrary motions) as impoſſible; nor pretend I
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from the denial thereof, to inferre a neceſſary Demonſtration,
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but onely a greater probability, of the other. </
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<
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>A third reaſon
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which maketh the
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Ptolomaique Hypotheſis
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leſſe probable is, that it
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moſt unreaſonably confoundeth the order, which we aſſuredly
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ſee to be amongſt thoſe Cœleſtial Bodies, the circumgyration of
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which is not queſtionable, but moſt certain. </
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>
<
s
>And that Order is,
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that according as an Orb is greater, it finiſheth its revolution in a
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longer time, and the leſſer, in ſhorter. </
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>
<
s
>And thus
<
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Saturn
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<
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bing a greater Circle than all the other Planets, compleateth the
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ſame in thirty yeares:
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Jupiter
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finiſheth his; that is leſſe, in
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twelve years:
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"/>
Mars
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in two: The Moon runneth thorow hers, ſo
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much leſſe than the reſt, in a Moneth onely. </
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>
<
s
>Nor do we leſſe
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ſenſibly ſee that of the
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Medicean Stars,
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which is neareſt to
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Ju-
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<
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piter,
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to make its revolution in a very ſhort time, that is, in four
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and forty hours, or thereabouts, the next to that in three dayes and
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an half, the third in ſeven dayes, and the moſt remote in ſixteen.
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</
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>
<
s
>And this rate holdeth well enough, nor will it at all alter, whileſt
<
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we aſſign the motion of 24 hours to the Terreſtrial Globe, for it
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to move round its own center in that time; but if you would have
<
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the Earth immoveable, it is neceſſary, that when you have paſt
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from the ſhort period of the Moon, to the others ſucceſſively
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bigger, until you come to that of
<
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type
="
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"/>
Mars
<
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type
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in two years, and from
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thence to that of the bigger Sphere of
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Jupiter
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in twelve years, and </
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