Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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nitum diminutam, rationes ultimæ erunt RGG ad T
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cub.
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ut-FF
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ad-3TT ſeu GG ad TT ut FF ad 3TT & viciſſim GG ad
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FF ut TT ad 3 TT id eſt, ut 1 ad 3; adeoque G ad F,
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hoc eſt angulus
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VCp
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ad angulum
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VCP,
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ut 1 ad √3. Er
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go cum corpus in Ellipſi immobili, ab Apſide ſumma ad Ap
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ſidem imam deſcendendo conficiat angulum
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VCP
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(ut ita di
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cam) gradum 180; corpus aliud in Ellipſi mobili, atque adeo in
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Orbe immobili de quo agimus, ab Apſide ſumma ad Apſidem
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imam deſcendendo conficiet angulum
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VCp
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gradum (180/√3): id
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adeo ob ſimilitudinem Orbis hujus, quem corpus agente uniformi
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vi centripeta deſcribit, & Orbis illius quem corpus in Ellipſi re
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volvente gyros peragens deſcribit in plano quieſcente. </
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periorem terminorum collationem ſimiles redduntur hi Orbes, non
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univerſaliter, ſed tunc cum ad formam circularem quam maxime
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appropinquant. </
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>Corpus igitur uniformi cum vi centripeta in
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Orbe propemodum circulari revolvens, inter Apſidem ſummam
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& Apſidem imam conficiet ſemper angulum (180/√3) graduum, ſeu
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103
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gr.
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55
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m.
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23
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ſec.
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ad centrum; perveniens ab Apſide ſumma ad
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Apſidem imam ubi ſemel confecit hunc angulum, & inde ad Apſi
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dem ſummam rediens ubi iterum confecit eundem angulum; &
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ſic deinceps in infinitum. </
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LIBER
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PRIMUS.</
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Exempl.
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2. Ponamus vim centripetam eſſe ut altitudinis A dig
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nitas quælibet A
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n
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-3
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ſeu (A
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/A
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3
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): ubi
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n
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-3 &
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ſignificant digNI
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tatum indices quoſcunQ.E.I.tegros vel fractos, rationales vel irratio
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nales, affirmativos vel negativos. </
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<
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>Numerator ille A
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n
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ſeu —T-X
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n
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in ſeriem indeterminatam per Methodum noſtram Serierum conver
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gentium reducta, evadit T
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n
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-
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XT
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-1
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+(
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nn-n
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/2)XXT
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-2
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&c. </
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Et collatis hujus terminis cum terminis Numeratoris alterius
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RGG-RFF+TFF-FFX, fit RGG-RFF+TFF ad T
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ut-FF ad-
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T
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-1
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+(
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/2)XT
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&c. </
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<
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nes ultimas ubi Orbes ad formam circularem accedunt, fit RGG
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ad T
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ut-FF ad-
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T
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-1
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, ſeu GG ad T
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ut FF ad
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T
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-1
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,
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& viciſſim GG ad FF ut T
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n
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-1
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ad
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T
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-1
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id eſt ut 1 ad
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n
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;
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adeoque G ad F, id eſt angulus
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VCp
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ad angulum
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VCP,
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