Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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entem verſus cum velocitatis parte una: movebitur Nauta vere &
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abſolute in ſpatio immoto cum velocitatis partibus 10001 in o
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rientem, & relative in terra occidentem verſus cum velocitatis
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partibus novem. </
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<
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>Tempus Abſolutum a relativo diſtinguitur in Aſtronomia per Æ
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quationem temporis vulgi. </
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<
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>Inæquales enim ſunt dies Naturales,
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qui vulgo tanquam æquales promenſura temporis habentur. </
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<
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>Hanc
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inæqualitatem corrigunt Aſtronomi, ut ex veriore tempore </
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motus cæleſtes. </
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>Poſſibile eſt, ut nullus ſit motus æquabilis quo
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Tempus accurate menſuretur. </
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>Accelerari & retardari poſſunt motus
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omnes, ſed fluxus temporis Abſoluti mutari nequit. </
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<
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>Eadem eſt du
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ratio ſeu perſeverantia exiſtentiæ rerum; ſive motus ſint celeres, ſive
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tardi, ſive nulli: proinde hæc a menſuris ſuis ſenſibilibus merito
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diſtinguitur, & ex iiſdem colligitur per Æquationem Aſtronomi
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cam. </
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<
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>Hujus autem æquationis in determinandis Phænomenis ne
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ceſſitas, tum per experimentum Horologii Oſcillatorii, tum etiam
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per eclipſes Satellitum Jovis evincitur. </
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<
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>Ut partium Temporis ordo eſt immutabilis, ſic etiam ordo par
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tium Spatii. </
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<
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>Moveantur hæ de locis ſuis, & movebuntur (ut ita
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dicam) de ſeipſis. </
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<
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>Nam tempora & ſpatia ſunt ſui ipſorum &
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rerum omnium quaſi Loca. </
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>In Tempore quoad ordinem ſucceſſi
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onis; in Spatio quoad ordinem ſitus locantur univerſa. </
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<
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>De illo
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rum eſſentia eſt ut ſint Loca: & loca primaria moveri abſurdum
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eſt. </
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<
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>Hæc ſunt igitur abſoluta Loca; & ſolæ tranſlationes de his lo
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cis ſunt abſoluti Motus. </
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<
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>Verum quoniam hæ Spatii partes videri nequeunt, & ab invi
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cem per ſenſus noſtros diſtingui; earum vice adhibemus menſuras
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ſenſibiles. </
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>Ex poſitionibus enim & diſtantiis rerum a corpore ali
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quo, quod ſpectamus ut immobile, deſinimus loca univerſa: deinde
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etiam & omnes motus æſtimamus cum reſpectu ad prædicta loca,
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quatenus corpora ab iiſdem transferri concipimus. </
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<
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>Sic vice loco
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rum & motuum abſolutorum relativis utimur; nec incommode in
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rebus humanis: in Philoſophicis autem abſtrahendum eſt a ſenſibus. </
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Fieri etenim poteſt, ut nullum revera quieſcat corpus, ad quod loca
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motuſque referantur. </
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<
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>Diſtinguuntur autem Quies & Motus abſoluti & relativi ab invi
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cem per Proprietates ſuas & Cauſas & Effectus. </
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<
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>Quietis proprietas
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eſt, quod corpora vere quieſcentia quieſcunt inter ſe. </
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<
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>Ideoque
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cum poſſibile ſit, ut corpus aliquod in regionibus Fixarum, aut longe
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ultra, quieſcat abſolute; ſciri autem non poſſit ex ſitu corporum
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ad invicem in regionibus noſtris, horumne aliquod ad longin-</
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