Descartes, René
,
Renati Des-Cartes principia philosophiae
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jori circulo circa Solem ferentur, minores ſuos cir
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culos circa Jovem aliquoties percurrant. </
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>Eodemque
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modo vortex, qui habet Terram in centro, efficiat ut
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Luna menſis ſpatio eam circumeat, ipſa autem Terra
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ſingulis diebus circa proprium axem integrum
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abſolvat; ita ut eodem tempore quo Terra & Luna cir
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culum communen ſemel peragrabunt, Terra 365 vici
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bus circa proprium centrum, & Luna duodecies circa
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Terram vertatur. </
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XXXIII.
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Quomodo etiam Terra
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circa proprium cen
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trum, & Luna circa
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Terram vehatur. </
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Denique, ne putemus omnia centra
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ac
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curatè in eodem plano ſemper conſiſtere, nec circulos
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quos deſcribunt eſſe omnino perfectos; ſed, ut in om
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nibus aliis rebus naturalibus contingere videmus, iſta
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tantúm praeterpropter talia eſſe, ac etiam labentibus
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ſaeculis continuò mutari arbitremur.
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XXXIV.
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Motus coelorum non
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eſſe perfectè circulares. </
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Nempe, ſi haec figura repraeſentet planum, in quo
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centrum Terrae toto anno verſatur, quod vocatur pla
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num Eclipticae atque ope Fixarum in coelo determi
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natur, putandum eſt unumquemque ex aliis Planetis
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in alio quodam plano verſari, ad hoc
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incli
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nato, & ipſum interſecante in lineâ quae tranſit per
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centrum Solis: ita ut Sol in omnibus iſtis planis repe
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riatur. </
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>Exempli cauſà, orbita Saturni ſecat nunc Eclip
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ticam in ſignis Cancri & Capricorni, ſupra ipſam au
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tem attollitur hoc eſt verſús Boream inclinatur
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Librâ, & infra eandem verſús Auſtrum deprimitur in
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Ariete anguluſque ipſius inclinationis eſt circiter gra
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duum
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. </
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>Sicque aliorum Planetarum orbitae ſecant
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Eclipticam in aliis locis; ſed inclinatio in Jove &
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Marte eſt minor, in Venere uno circiter gradu major,
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&sin Mercurio maxima: eſt enim fere 7 graduum. </
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