Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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niſi per hanc Regulam de rerum univerſarum natura judica
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mus. </
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<
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>Jam cum Gravia ſint omnia corpora, quæ apud Terram vel in
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Cælis reperiuntur, de quibus Experimenta vel Obſervationes in
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ſtituere licet; omnino dicendum erit, Gravitatem corporibus uNI
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verſis competere. </
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<
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>Et quemadmodum nulla concipi debent cor
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pora, quæ non ſint Extenſa, Mobilia, & Impenetrabilia; ita nulla
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concipi debere, quæ non ſint Gravia. </
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<
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>Corporum Extenſio, Mobi
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litas, & Impenetrabilitas non niſi per Experimenta innoteſcunt:
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eodem plane modo Gravitas innoteſcit. </
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<
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>Corpora omnia de qui
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bus Obſervationes habemus, Extenſa ſunt & Mobilia & Impene
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trabilia: & inde concludimus corpora univerſa, etiam illa de qui
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bus Obſervationes non habemus, Extenſa eſſe & Mobilia & Im
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penetrabilia. </
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<
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>Ita corpora omnia ſunt Gravia, de quibus Obſer
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vationes habemus: & inde concludimus corpora univerſa, etiam
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illa de quibus Obſervationes non habemus, Gravia eſſe. </
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<
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>Si quis
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dicat corpora Stellarum inerrantium non eſſe Gravia, quandoqui
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dem eorum Gravitas nondum eſt obſervata; eodem argumento
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dicere licebit neque Extenſa eſſe, nec Mobilia, nec Impenetrabilia,
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cum hæ Fixarum affectiones nondum ſint obſervatæ. </
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<
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>Quid opus
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eſt verbis? </
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<
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>Inter primarias qualitates corporum univerſorum vel
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Gravitas habebit locum; vel Extenſio, Mobilitas, & Impenetra
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bilitas non habebunt. </
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<
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>Et natura rerum vel recte explicabitur
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per corporum Gravitatem, vel non recte explicabitur per corpo
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rum Extenſionem, Mobilitatem, & Impenetrabilitatem. </
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<
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>Audio nonnullos hanc improbare concluſionem, & de occultis
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qualitatibus neſcio quid muſſitare. </
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>Gravitatem ſcilicet Occultum
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eſſe quid, perpetuo argutari ſolent; occultas vero cauſas pro
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cul eſſe ablegandas a Philoſophia. </
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<
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>His autem facile reſpon
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detur; occultas eſſe cauſas, non illas quidem quarum exiſtentia
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per Obſervationes clariſſime demonſtratur, ſed has ſolum quarum
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occulta eſt & ficta exiſtentia nondum vero comprobata. </
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<
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>Gravitas
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ergo non erit occulta cauſa motuum cæleſtium; ſiquidem ex Phæ
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nomenis oſtenſum eſt, hanc virtutem revera exiſtere. </
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<
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>Hi potius
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ad occultas confugiunt cauſas; qui neſcio quos Vortices, materiæ
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cujuſdam prorſus fictitiæ & ſenſibus omnino ignotæ, motibus
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iiſdem regendis præficiunt. </
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<
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>Ideone autem Gravitas occulta cauſa dicetur, eoque nomine
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rejicietur e Philoſophia, quod cauſa ipſius Gravitatis occulta eſt
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& nondum inventa? </
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<
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>Qui ſic ſtatuunt, videant nequid ſtatu</
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