Descartes, René
,
Renati Des-Cartes principia philosophiae
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ipſis adionem illam obliquè excipiunt; ideòque, quam
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vis praecipuum ejus radium rectà verſùs B deducant,
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innumeros tamen alios debiliores utrimque verſùs D
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&sE diſpergunt. </
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>Eodemque modo, ſi pellatur globus F
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verſùs G, cùm ejus actio pervenit ad H,
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communi
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catur globulis 7, 8, 9, qui praecipuum quidem ejus
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radium mittunt ad G, ſed alios etiam verſùs D & B
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diſpergunt. </
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>Hîcque notanda eſt differential, quae oritur
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ex obliquitate incidentiae iſtarum adionum in circu
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lum CH: actio enim ab A ad C,
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perpendicula
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riter incidat in illum circulum, radios ſuos aequaliter
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utrimque diſpergit verſùs D & E; actio autem ab F ad
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H, quae in eundem obliquè incidit, non diſpergit ſuos
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niſi verſùs ipſius centrum, ſaltem ſi obliquitas inci
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dentiae ſupponatur eſſe graduum 90; ſi
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ſuppona
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tur minor, nonnulli quidem ejus actionis radii etiam
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in aliam partem mittentur, ſed aliis multò debiliores,
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&sideò vix ſenſibiles, niſi cùm iſta obliquitas eſt valde
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parva: contrà autem radii, qui verſùs centrum circuli
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obliquè ſparguntur, eò ſunt fortèiores, quòd
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obli
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quitas eſt major. </
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CXXXV.
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Explicatio iſtius re
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fractionis. </
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Quorum omnium demonſtratione percept^, facile
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eſt illam transferre ad globulos coeleſtes: quamvis
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enim nullus ſit locus, in quo ſic majuſculi ex iſtis
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globulis alios multò minores tangant, quia tamen
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gradatim ſunt minores & minores, à certo termino
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uſque ad Solem, ut dictum eſt a, facilè credi poteſt non
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minorem eſſe differentiam, inter illos qui ſunt ſupra
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orbitam Saturni, & illos qui ſunt juxta orbitam Terrae,
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quàm inter majores & minores mox deſcriptos
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