Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1viribus prioribus majores; adeoque (per Corol. 1. Prop. X. & Corol.
1 & 8. Prop, IV) efficiunt ut corpora illa deſcribant Ellipſes ut prius,
ſed motu celeriore.
Vires reliquæ acceleratrices SD& SD,actio­
nibus motricibus SDXT& SDXL,quæ ſunt ut corpora, tra­
hendo corpora illa æqualiter & ſecundum lineas TI, LK,ipſi DS
parallelas, nil mutant ſitus eorum ad invicem, ſed faciunt ut ipſa
æqualiter accedant ad lineam IK; quam ductam concipe per me­
dium corporis S,& lineæ DSperpendicularem. Impedietur au­
tem iſte ad lineam IKacceſſus faciendo ut Syſtema corporum T& L
ex una parte, & corpus Sex altera, juſtis cum velocitatibus, gyren­
tur circa commune gravitatis centrum C.Tali motu corpus S
(eo quod ſumma virium motricium SDXT& SDXL,diſtan­
tiæ CSproportionalium, tendit verſus centrum C) deſcribit El­
lipſin circa idem C;& punctum D,ob proportionales CS, CD,
deſcribet Ellipſin conſimilem e regione.
Corpora autem T& L
viribus motricibus SDXT
106[Figure 106]
& SDXL,(prius priore,
poſterius poſteriore) æqua­
liter & ſecundum lineas pa­
rallelas TI& LK(ut dic­
tum eſt) attracta, pergent
(per Legum Corollarium
quintum & ſextum) circa cen­
trum mobile DEllipſes ſuas
deſcribere, ut prius. Q.E.I.
DE MOTU
CORPORUM
Addatur jam corpus quartum V,& ſimili argumento conclude­
tur hoc & punctum CEllipſes circa omnium commune centrum
gravitatis Bdeſcribere; manentibus motibus priorum corporum
T, L& Scirca centra D& C,ſed paulo acceleratis. Et eadem
methodo corpora plura adjungere licebit. Q.E.I.
Hæc ita ſe habent ubi corpora T& Ltrahunt ſe mutuo viribus
acceleratricibus majoribus vel minoribus quam quibus trahunt cor­
pora reliqua pro ratione diſtantiarum.
Sunto mutuæ omnium at­
tractiones acceleratrices ad invicem ut diſtantiæ ductæ in corpo­
ra trahentia, & ex præcedentibus facile deducetur quod corpora
omnia æqualibus temporibus periodicis Ellipſes varias, circa om­
nium commune gravitatis centrum B,in plano immobili deſcri­
bunt. Q.E.I.

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