Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1vi centripeta TVqua corpus Qin ſpatio libero circa centrum
datum Crevolvitur, datur per Prop. XLII, tum Trajectoria PQR
quam corpus deſcribit, tum locus Qin quo corpus ad datum quod­
vis tempus verſabitur, tum denique velocitas corporis in loco illo
Q; & contra. que E. I.
LIBER
PRIMUS.
PROPOSITIO XLVII. THEOREMA XV.
Poſito quod Vis centripeta proportionalis ſit diſtantiæ corporis a
centro; corpora omnia in planis quibuſcunque revolventia de­
ſcribent Ellipſes, & revolutiones Temporibus æqualibus peragent;
quæque moventur in lineis rectis, ultro citroQ.E.D.ſcurrendo,
ſingulas eundi & redeundi periodos iiſdem Temporibus abſol­
vent.
Nam, ſtantibus quæ
96[Figure 96]
in ſuperiore Propoſitio­
ne, vis SVqua corpus
Qin plano quovis PQR
revolvens trahitur ver­
ſus centrum Seſt ut di­
ſtantia Squeatque adeo
ob proportionales SV
& SQ, TV& CQ,vis
TVqua corpus trahi­
tur verſus punctum C
in Orbis plano datum,
eſt ut diſtantia C Q.Vi­
res igitur, quibus cor­
pora in plano PQR
verſantia trahuntur ver­
ſus punctum C,ſunt pro
ratione diſtantiarum æquales viribus quibus corpora undiquaque
trahuntur verſus centrum S; & propterea corpora movebuntur iiſ­
dem Temporibus, in iiſdem Figuris, in plano quovis PQRcirca
punctum C,atQ.E.I. ſpatiis liberis circa centrum S; adeoque (per
Corol.
2. Prop. X, & Corol. 2. Prop. XXXVIII) Temporibus ſemper

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