Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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tionalis, id eſt, qui ſit ad quatuor rectos, ut eſt tempus quo corpus
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deſcripſit arcum
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Ap,
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ad tempus revolutionis unius in Ellipſi. </
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angulus iſte N. </
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<
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>Tum capiatur & angulus D ad angulum B, ut
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eſt ſinus iſte anguli
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AOQ
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ad radium, & angulus E ad angulum
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N-
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AOQ
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+D, ut eſt longitudo L ad longitudinem eandem L
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coſinu anguli
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AOQ
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diminutam, ubi angulus iſte recto minor eſt,
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auctam ubi major. </
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>Poſtea capiatur tum angulus F ad angulum B,
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ut eſt ſinus anguli
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+E ad radium, tum angulus G ad angu
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lum N-
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AOQ
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-E+F ut eſt longitudo L ad longitudinem ean
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dem coſinu anguli
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AOQ
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+E diminutam ubi angulus iſte recto mi
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nor eſt, auctam ubi major. </
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>Tertia vice capiatur angulus H ad an
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gulum B, ut eſt ſinus anguli
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+E+G ad radium; & angu
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lus I ad angulum N-
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AOQ
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-E-G+H, ut eſt longitudo L ad
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eandem longitudinem coſinu anguli
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AOQ
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+E+G diminutam,
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ubi angulus iſte re
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cto minor eſt, auc
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tam ubi major. </
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<
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>Et
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ſic pergere licet in
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infinitum. </
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>DeNI
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que capiatur angu
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lus
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AOq
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æqualis
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angulo
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+E
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+G+I+&c. </
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>e t
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ex coſinu ejus
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Or
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& ordinata
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pr,
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quæ
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eſt ad ſinum ejus
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qr
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ut Ellipſeos axis minor ad axem majorem, habebitur corporis
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locus correctus
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p.
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Si quando angulus N-
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+D negativus
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eſt, debet ſignum+ipſius E ubique mutari in-, & ſignum-in+.
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Idem intelligendum eſt de ſignis ipſorum G & I, ubi anguli
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N-
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-E+F, & N-
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-E-G+H negativi prodeunt. </
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Convergit autem ſeries infinita
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+E+G+I+&c. </
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<
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>quam
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celerrime, adeo ut vix unquam opus fuerit ultra progredi quam
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ad terminum ſecundum E. </
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<
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>Et fundatur calculus in hoc Theore
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mate, quod area
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APS
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ſit ut differentia inter arcum
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AQ
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&
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rectam ab umbilico
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S
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in Radium
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OQ
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perpendiculariter de
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miſſam. </
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DE MOTU
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CORPORUM</
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<
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>Non diſſimili calculo conficitur Problema in Hyperbola. </
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<
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ejus Centrum
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O,
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Vertex
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A,
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Umbilicus
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S
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& Aſymptotos
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OK.
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Cog-</
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