Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
DE MOTU
CORPORUM
Corollarium.
Hinc area Ellipſeos, quæ radio ab umbilico ad corpus mobile
ducto deſcribitur, non prodit ex dato tempore, per æquationem
finitam; & propterea per deſcriptionem Curvarum Geometrice ra­
tionalium determinari nequit.
Curvas Geometrice rationales ap­
pello quarum puncta omnia per longitudines æquationibus defiNI­
tas, id eſt, per longitudinum rationes complicatas, determinari
poſſunt; cæteraſque (ut Spirales, Quadratrices, Trochoides) Geo­
metrice irrationales.
Nam longitudines quæ ſunt vel non ſunt ut
numerus ad numerum (quemadmodum in decimo Elementorum)
ſunt Arithmetice rationales vel irrationales.
Aream igitur Ellipſeos
tempori proportionalem abſcindo per Curvam Geometrice irratio­
nalem ut ſequitur.
PROPOSITIO XXXI. PROBLEMA XXIII.
Corporis in data Trajectoria Elliptica moti invenire locum ad
tempus aſſignatum.
Ellipſeos APBſit Avertex principalis, Sumbilicus, & O
centrum, ſitque Pcorporis locus inveniendus. Produc OAad G,
ut ſit OGad OAut OAad OS.Erige perpendiculum GH,centroque
74[Figure 74]
O& intervallo OGdeſcribe circulum EFG,& ſuper regula GH,
ceu fundo, progrediatur Rota GEFrevolvendo circa axem
ſuum, & interea puncto ſuo Adeſcribendo Trochoidem ALI.

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