Descartes, René
,
Renati Des-Cartes principia philosophiae
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major & potentior evadet, ut ſi vortex H extendat
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ſuam ſuperficiem uſque ad lineam 567, tunc facilè
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vortex H totum ſidus C, non hîc
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ampliùs fluidum & lucidum, ſed,
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Cometae vel Planetae
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du
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rum & opacum, ſecum abducet. </
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CXVIII.
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Quomodo iſtae multae,
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maculae generentur. </
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Jam verò conſiderandum eſt,
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quâ ratione debeat moveri talis
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globus opacus & durus, ex mul
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tarum macularum
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com
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poſitus, cùm primùm ab aliquo
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vortice ſibi vicino abreptus eſt. </
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>Nempe ita gyrat cum
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materiâ à quâ abripitur, ut quandiu minùs habet agi
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tationis quàm ipſa, verſùs centrum circa quod gyrat
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detrudatur. </
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>Et quia omnes partes ejuſdem vorticis
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eâdem celeritate moventur, nec ſunt ejuſdem magnitu
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dinis; ſed à circumferentià uſque ad certum terminum
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earum motus gradatim ſit tardior, ac deinde ab iſto ter
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mino uſque ad centrum gradatim fit celerior, & ipſae
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ſunt minutiores, ut ſuprà dictum eſt a: ſi globus in
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vortice deſcendens adeò ſit ſolidus, ut priuſquam perve
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nerit ad terminum in quo partes vorticis omnium tar
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diſſimè moventur, acquirat agitationem aequalem agi
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tationi earum partium, inter quas verſatur, non ulte
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riùs deſcendit, ſed ex illo vortice in alios tranſit, &
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Cometa. </
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>Si verò minùs habeat ſoliditatis, atque idcirco
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infra terminum illum deſcendat, ibi poſtea ad certam
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diſtantiam à ſidere, quod illius vorticis centrum occu
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pat, ſemper manens, circa ipſum rotatur, & eſt Planeta b. </
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