Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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bent circum ſe mutuo Figuras eaſdem ac prius, & propterea Figuræ
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pqv
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ſimiles & æquales.
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Q.E.D.
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DE MOTU
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CORPORUM</
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Corol.
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1. Hinc corpora duo Viribus diſtantiæ ſuæ proportionali
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bus ſe mutuo trahentia, deſcribunt (per Prop. </
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mune gravitatis centrum, & circum ſe mutuo, Ellipſes concentri
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cas: & vice verſa, ſi tales Figuræ deſcribuntur, ſunt Vires diſtan
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tiæ proportionales. </
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Corol.
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2. Et corpora duo Viribus quadrato diſtantiæ ſuæ recipro
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ce proportionalibus deſcribunt (per Prop. </
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>XI, XII, XIII) & circum
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commune gravitatis centrum, & circum ſe mutuo, Sectiones conicas
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umbilicum habentes in centro circum quod Figuræ deſcribuntur. </
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<
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>Et
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vice verſa, ſi tales Figuræ deſcribuntur, Vires centripetæ ſunt qua
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drato diſtantiæ reciproce proportionales. </
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Corol.
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3. Corpora duo quævis cirum gravitatis centrum com
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mune gyrantia, radiis & ad centrum illud & ad ſe mutuo ductis,
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deſcribunt areas temporibus proportionales. </
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PROPOSITIO LIX. THEOREMA XXII.
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Corporum duorum
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S
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&
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P
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circa commune gravitatis centrum
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C
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revolventium Tempus periodicum eſſe ad Tempus periodicum cor
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poris alterutrius
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P,
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circa alterum immotum
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S
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gyrantis & Figu
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ris quæ corpora circum ſe mutuo deſcribunt Figuram ſimilem &
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æqualem deſcribentis, in ſubduplicata ratione corporis alterins
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S,
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ad ſummam corporum
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S+P. </
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<
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>Namque, ex demonſtratione ſuperioris Propoſitionis, tempora
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quibus arcus quivis ſimiles
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PQ
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&
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pq
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deſcribuntur, ſunt in ſub
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duplicata ratione diſtantiarum
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CP
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&
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SP
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vel
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sp,
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hoc eſt, in ſub
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duplicata ratione corporis
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S
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ad ſummam corporum
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S+P.
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Et com
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ponendo, ſummæ temporum quibus arcus omnes ſimiles
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PQ
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&
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pq
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deſcribuntur, hoc eſt, tempora tota quibus Figuræ totæ ſimiles de
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ſcribuntur, ſunt in eadem ſubduplicata ratione.
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Q.E.D.
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