Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                    <pb xlink:href="039/01/148.jpg" pagenum="120"/>
                    <arrow.to.target n="note96"/>
                  primum urgetur in
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                  I,
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                  ut
                    <emph type="italics"/>
                  DR
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                  ad
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                  DF.
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                  Pergat autem corpus verſus
                    <lb/>
                    <emph type="italics"/>
                  k;
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                  centroque
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                  C
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                  & intervallo
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                  Ck
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                  deſcribatur circulus
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                  ke
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                  occurrens
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                  rectæ
                    <emph type="italics"/>
                  PD
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                  in
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                  e,
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                  & erigantur curvarum
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                  ALMm, BFGg, abzv, dcxw
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                    <lb/>
                    <figure id="id.039.01.148.1.jpg" xlink:href="039/01/148/1.jpg" number="92"/>
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                  ordinatim applicatæ
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                  em, eg, ev, ew.
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                  Ex dato rectangulo
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                  PDRQ,
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                    <lb/>
                  dataque lege vis centripetæ qua corpus primum agitatur, dantur cur­
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                  væ lineæ
                    <emph type="italics"/>
                  BFGg, ALMm,
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                  per conſtructionem Problematis XXVII,
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                  & ejus Corol. </s>
                  <s>1. Deinde ex dato angulo
                    <emph type="italics"/>
                  CIT
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                  datur proportio naſcen­
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                  tium
                    <emph type="italics"/>
                  IK, KN,
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                  & inde, per conſtructionem Prob. </s>
                  <s>XXVIII, datur
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                  quantitas Q, una cum curvis lineis
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                  abzv, dcxw:
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                  adeoque com­
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                  pleto tempore quovis
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                  Dbve,
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                  datur tum corporis altitudo
                    <emph type="italics"/>
                  Ce
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                  vel
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                  Ck,
                    <emph.end type="italics"/>
                    <lb/>
                  tum area
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                  Dcwe,
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                  eique æqualis Sector
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                  XCy,
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                  anguluſque
                    <emph type="italics"/>
                  ICk
                    <emph.end type="italics"/>
                  &
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                  locus
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                  k
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                  in quo corpus tunc verſabitur.
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                  Q.E.I.
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                  </s>
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                <p type="margin">
                  <s>
                    <margin.target id="note96"/>
                  DE MOTU
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                  CORPORUM</s>
                </p>
                <p type="main">
                  <s>Supponimus autem in his Propoſitionibus Vim centripetam in
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                  receſſu quidem a centro variari ſecundum legem quamcunque quam
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                  quis imaginari poteſt, in æqualibus autem a centro diſtantiis eſſe
                    <lb/>
                  undeque eandem. </s>
                  <s>Atque hactenus Motum corporum in Orbibus
                    <lb/>
                  immobilibus conſideravimus. </s>
                  <s>Supereſt ut de Motu eorum in Orbi­
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                  bus qui circa centrum virium revolvuntur adjiciamus pauca. </s>
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