Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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ſuarum fundamentum deſumunt ab Hypotheſibus, etiamſi deinde
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ſecundum leges Mechanicas accuratiſſime procedant; Fabulam qui
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dem elegantem forte & venuſtam, Fabulam tamen concinnare di
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cendi ſunt. </
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<
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>Relinquitur adeo tertium genus, qui Philoſophiam ſcilicet Ex
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perimentalem profitentur. </
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<
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>Hi quidem ex ſimpliciſſimis quibus
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poſſunt principiis rerum omnium cauſas derivandas eſſe volunt:
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nihil autem Principii loco aſſumunt, quod nondum ex Phænome
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nis comprobatum fuerit. </
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<
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>Hypotheſes non comminiſcuntur, neque
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in Phyſicam recipiunt, niſi ut Quæſtiones de quarum veritate diſ
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putetur. </
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<
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>Duplici itaque Methodo incedunt, Analytica & Syn
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thetica. </
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<
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>Naturæ vires legeſque virium ſimpliciores ex ſelectis
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quibuſdam Phænomenis per Analyſin deducunt, ex quibus deinde
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per Syntheſin reliquorum conſtitutionem tradunt. </
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<
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>Hæc illa eſt
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Philoſophandi ratio longe optima, quam præ ceteris merito am
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plectendam cenſuit Celeberrimus Auctor noſter. </
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>Hanc ſolam uti
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Q.E.D.gnam judicavit, in qua excolenda atque adornanda operam
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ſuam collocaret. </
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<
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>Hujus igitur illuſtriſſimum dedit Exemplum,
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Mundani nempe Syſtematis explicationem e Theoria Gravitatis
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feliciſſime deductam. </
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<
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>Gravitatis virtutem univerſis corporibus in
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eſſe, ſuſpicati ſunt vel finxerunt alii: primus Ille & ſolus ex Ap
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parentiis demonſtrare potuit, & ſpeculationibus egregiis firmiſſi
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mum ponere fundamentum. </
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>Scio equidem nonnullos magni etiam nominis Viros, præjudiciis
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quibuſdam plus æquo occupatos, huic novo Principio ægre aſſen
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tiri potuiſſe, & certis incerta identidem prætuliſſe. </
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<
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>Horum famam vel
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licare non eſt animus: Tibi potius, Benevole Lector, illa paucis ex
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ponere lubet, ex quibus Tute ipſe judicium non iniquum feras. </
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>Igitur ut Argumenti ſumatur exordium a ſimpliciſſimis & pro
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ximis; deſpiciamus pauliſper qualis ſit in Terreſtribus natura Gra
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vitatis, ut deinde tutius progrediamur ubi ad corpora Cæleſtia, lon
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giſſime a ſedibus noſtris remota, perventum fuerit. </
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<
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>Convenit jam
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inter omnes Philoſophos, corpora univerſa circumterreſtria gra
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vitare in Terram. </
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>Nulla dari corpora vere levia, jamdudum
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confirmavit Experientia multiplex. </
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<
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>Quæ dicitur Levitas relativa,
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non eſt vera Levitas, ſed apparens ſolummodo; & oritur a præ
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pollente Gravitate corporum contiguorum. </
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<
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>Porro, ut corpora univerſa gravitant in Terram, ita Terra viciſ
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ſim in corpora æqualiter gravitat; Gravitatis enim actionem eſſe
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mutuam & utrinque æqualem, ſic oſtenditur. </
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<
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>Diſtinguatur Terræ </
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