Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1tra petentium, & planis excentricis innitentium hic conſiderandus
venit.
Plana autem ſupponimus eſſe politiſſima & abſolute lubrica
ne corpora retardent.
Quinimo, in his demonſtrationibus, vi­
ce planorum quibus corpora incumbunt quæque tangunt incum­
bendo, uſurpamus plana his parallela, in quibus centra corpo­
rum moventur & Orbitas movendo deſcribunt.
Et eadem lege
Motus corporum in ſuperficiebus Curvis peractos ſubinde de­
terminamus.
DE MOTU
CORPORUM
SECTIO X.
De Motu Corporum in Superficiebus datis, deque Funipendulorum
Motu reciproco.
PROPOSITIO XLVI. PROBLEMA XXXII.
Poſita cujuſcunque generis Vi centripeta, datoque tum Virium cen­
tro tum Plano quocunQ.E.I. quo corpus revolvitur, & conceſ­
ſis Figurarum curvilinearum quadraturis: requiritur Motus cor­
poris de loco dato, data cum Velocitate, ſecundum rectam in
Plano illo datam egreſſi.
Sit Scentrum Virium, SCdiſtantia minima centri hujus a Plano
dato, Pcorpus de loco Pſecundum rectam PZegrediens, Q
corpus idem in Trajectoria ſua revolvens, & PQRTrajectoria
illa, in Plano dato deſcripta, quam invenire oportet.
Jungantur CQ
QS,& ſi in QScapiatur SVproportionalis vi centripetæ qua
corpus trahitur verſus centrum S,& agatur VTquæ fit parallela
CQ& occurrat SCin T:Vis SVreſolvetur (per Legum Corol. 2.)
in vires ST, TV;quarum STtrahendo corpus ſecundum lineam
plano perpendicularem, nil mutat motum ejus in hoc plano.
Vis
autem altera TV,agendo ſecundum poſitionem plani, trahit cor­
pus directe verſus punctum Cin plano datum, adeoque facit illud
in hoc plano perinde moveri ac ſi vis STtolleretur, & corpus vi
ſola TVrevolveretur circa centrum Cin ſpatio libero. Data autem

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