Descartes, René
,
Renati Des-Cartes principia philosophiae
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centro expellent; atque ita omnes ad guttam ſphaeri
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cam faciendam concurrent. </
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gentiae, quo ſolo linea circularis à rectà diſtat, omni
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angulo rectilineo ſit minor, & in nullâ lineâ curvâ prae
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terquam in circulari ſit ubique aequalis: certum eſt,
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lineam rectam nunquam poſſe magis aequaliter, & mi
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nus in unoquoque ex ſuis punctis inflecti, quàm cùm
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degenerat in circularem. </
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XIX.
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De Tertio effectu: quòd
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liquorum guttas red
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dat rotundas. </
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Vis gravitatis à tertià iſtâ globulorum coeleſtium
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actione non multum diſſert. </
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ſolum ſuum motum, quo ſine diſcrimine quaquaverſus
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feruntur, omnes cujuſque guttae particulas verſus ejus
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centrum aequaliter premunt, ſicque ipſam guttam fa
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ciunt rotundam: ita per eundem motum, totius molis
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terrae occurſu impediti, ne ſecundùm lineas
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ſe
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rantur, omnes ejus partes verſus medium propellunt:
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atque in hoc gravitas corporum terreſtrium conſiſtit. </
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XX.
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Explicatio ſecundae
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actionis, quae gravi
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tas vocatur. </
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Cujus natura ut perfectè intelligatur, notandum eſt
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primò, ſi omnia ſpatia circa Terram, quae ab ipſius
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Terrae materiâ non occupantur, vacua eſſent, hoc eſt,
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ſi nihil continerent niſi corpus, quod motus aliorum
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corporum nullà ratione impediret nec juvaret (ſic
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enim tantùm intelligi poteſt vacui nomen), & interim
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haec terra circa ſuum axem, ſpatio viginti quatuor ho
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rarum, proprio motu volveretur, fore ut illae
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ejus partes, quae ſibi mutuò non eſſent valde firmiter
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alligatae, hinc inde verſus coelum diſſilirent: eodem
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modo, quo videre licet, dum turbo gyrat, ſi arena
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ſupra ipſum conjiciatur, eam ſtatim ab illo recedere
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atque in omnes partes diſpergi; & ita Terra
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gra
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vis, ſed contrà potiùs levis eſſe dicenda. </
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