Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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una tendente ad
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T
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& oriunda a mutua attractione corporum
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&
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P.
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Hac vi ſola corpus
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circum corpus
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T,
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ſive immotum ſive hac
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attractione agitatum, deſcribere deberet & areas, radio
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PT,
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tem
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poribus proportionales, & Ellipſin cui umbilicus eſt in centro cor
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poris
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T.
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Patet hoc per Prop. </
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>XI. & Corollaria 2 & 3 Theor. </
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>XXI. </
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>Vis
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altera eſt attractionis
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LM,
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quæ quoniam tendit a
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ad
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ſuperad
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dita vi priori coincidet cum ipſa, & ſic faciet ut areæ etiamnum tem
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poribus proportionales deſcribantur per Corol. </
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>3. Theor. </
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>XXI. </
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<
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quoniam non eſt quadrato diſtantiæ
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PT
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reciproce proportionalis,
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componet ea cum vi priore vim ab hac proportione aberrantem, id
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que eo magis quo major eſt proportio hujus vis ad vim priorem,
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cæteris paribus. </
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<
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>Proinde cum (per Prop. </
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>XI, & per Corol. </
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>2.
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Theor. </
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>XXI) vis qua Ellipſis circa umbilicum
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T
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deſcribitur tendere
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debeat ad umbilicum illum, & eſſe quadrato diſtantiæ
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PT
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reciproce
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proportionalis; vis illa
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compoſita, aberrando
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ab hac proportione, fa
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ciet ut Orbis
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PAB
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aberret a forma Ellip
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ſeos umbilicum haben
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tis in
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S;
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idque eo ma
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gis quo major eſt ab
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erratio ab hac propor
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tione; atque adeo eti
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am quo major eſt proportio vis ſecundæ
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LM
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ad vim primam, cæ
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teris paribus. </
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<
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SM,
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trahendo corpus
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ſecun
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dum lineam ipſi
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ST
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parallelam, componet cum viribus prioribus
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vim quæ non amplius dirigitur a
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in
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quæque ab hac determi
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natione tanto magis aberrat, quanto major eſt proportio hujus ter
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tiæ vis ad vires priores, cæteris paribus; atque adeo quæ faciet ut
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corpus
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radio
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areas non amplius temporibus proportiona
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les deſcribat, atque aberratio ab hac proportionalitate ut tanto ma
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jor ſit, quanto major eſt proportio vis hujus tertiæ ad vires cæte
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ras. </
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<
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>Orbis vero
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PAB
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aberrationem a forma Elliptica præfata hæc
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vis tertia duplici de cauſa adaugebit, tum quod non dirigatur a
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ad
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tum etiam quod non ſit proportionalis quadrato diſtantiæ
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PT.
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Quibus intellectis, manifeſtum eſt quod areæ temporibus tum max
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ime fiunt proportionales, ubi vis tertia, manentibus viribus cæte
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ris, fit minima; & quod Orbis
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PAB
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tum maxime accedit ad præ
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fatam formam Ellipticam, ubi vis tam ſecunda quam tertia, ſed præ
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cipue vis tertia, fit minima, vi prima manente. </
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