Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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SPXQT
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ut area dato tempore deſcripta, id eſt, per Prop. </
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in ſubduplicata ratione lateris recti.
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Q.E.D.
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LIBER
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PRIMUS.</
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Corol.
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1. Latera recta principalia ſunt in ratione compoſita ex
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duplicata ratione perpendiculorum & duplicata ratione veloci
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tatum. </
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Corol.
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2. Velocitates corporum in maximis & minimis ab umbi
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lico communi diſtantiis, ſunt in ratione compoſita ex ratione di
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ſtantiarum inverſe & ſubduplicata ratione laterum rectorum princi
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palium directe. </
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>Nam perpendicula jam ſunt ipſæ diſtantiæ. </
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Corol.
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3. Ideoque velocitas in Conica ſectione, in maxima vel
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minima ab umbilico diſtantia, eſt ad velocitatem in Circulo in ea
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dem à centro diſtantia, in ſubduplicata ratione lateris recti princi
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palis ad duplam illam diſtantiam. </
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Corol.
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4. Corporum in Ellipſibus gyrantium velocitates in medi
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ocribus diſtantiis ab umbilico communi ſunt eædem quæ corporum
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gyrantium in Circulis ad eaſdem diſtantias; hoc eſt (per Corol 6.
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Prop. </
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>IV.) reciproce in ſubduplicata ratione diſtantiarum. </
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perpendicula jam ſunt ſemi-axes minores; & hi ſunt ut mediæ
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proportionales inter diſtantias & latera recta. </
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<
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ratio inverſe cum ſubduplicata ratione laterum rectorum directe, &
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fiet ratio ſubduplicata diſtantiarum inverſe. </
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Corol.
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5. In eadem figura, vel etiam in figuris diverſis, quarum </
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