Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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DE MUNDI
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SYSTEMATE</
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LEMMA X.
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Si producatur
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ad
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N & P,
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ut
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N
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ſit pars tertia ipſius
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I,
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& SP
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ſit ad
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SN
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ut
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SN
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ad
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S
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.
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Cometa, quo tempore deſcri
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bit arcum
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A
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C,
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ſi progrederetur ea ſemper cum velocitate
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quam habet in altitudine ipſi
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SP
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æquali, deſcriberet longitudi
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nem æqualem chordæ
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AC. </
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<
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>Nam ſi Cometa velocitate quam habet in
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, eodem tempore
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progrederetur uniformiter in recta quæ Parabolam tangit in
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;
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area quam radio ad punctum
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S
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ducto deſcriberet, æqualis eſſet
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areæ Parabolicæ
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ASC
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<
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>Ideoque contentum ſub longitudine in
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tangente deſcripta & longitudine
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S
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, eſſet ad contentum ſub
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longitudinibus
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AC
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&
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SM,
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ut area
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ASC
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ad triangulum
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ASCM,
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id eſt, ut
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SN
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ad
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SM.
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Quare
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AC
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eſt ad longitudi
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nem in tangente deſcriptam, ut
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ad
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SN.
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Cum autem velocitas
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Cometæ in altitudine
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ſit (per Corol. </
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<
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<
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>XVI. Lib. </
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>I.)
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ad velocitatem in altitudine
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S
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, in ſubduplicata ratione
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SP
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ad
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S
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inverſe, id eſt, in ratione
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ad
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SN
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; longitudo hac velo
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citate eodem tempore deſcripta, erit ad longitudinem in tangente
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deſcriptam, ut
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S
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ad
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SN,
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Igitur
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AC
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& longitudo hac nova ve
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locitate deſcripta, cum ſint ad longitudinem in tangente deſcrip
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tam in eadem ratione, æquantur inter ſe.
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Q.E.D.
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Corol.
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Cometa igitur ea cum velocitate, quam habet in altitudine
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S
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+2/3
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I
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, eodem tempore deſcriberet chordam
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AC
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quamproxime. </
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