Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  DE MOTU
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                  CORPORUM</s>
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                  PROPOSITIO LXVIII. THEOREMA XXVIII.
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                  Poſitis iiſdem attractionum legibus, dico quod corpus exterius
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                  S,
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                  circa interiorum
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                  P & T
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                  commune gravitatis centrum
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                  C,
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                  ra­
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                  diis ad centrum illud ductis, deſcribit areas temporibus magis
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                  proportionales, & Orbem ad formam Ellipſeos umbilicum in
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                  centro eodem habentis magis accedentem, ſi corpus intimum &
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                  maximum his attractionibus perinde atque cætera agitetur, quam
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                  ſi id vel non attractum quieſcat, vel multo magis aut multo
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                  minus attractum aut multo magis aut multo minus agitetur.
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                  <s>Demonſtratur eo­
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                  dem fere modo cum
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                  Prop. </s>
                  <s>LXVI, ſed ar­
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                  gumento prolixiore,
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                  quod ideo prætereo. </s>
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                  Suffecerit rem ſic æſti­
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                  mare. </s>
                  <s>Ex demonſtra­
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                  tione Propoſitionis
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                  noviſſimæ liquet cen­
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                  trum in quod corpus
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                    <emph type="italics"/>
                  S
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                  conjunctis viribus urgetur, proximum eſſe communi centro gra­
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                  vitatis duorum illorum. </s>
                  <s>Si coincideret hoc centrum cum centro
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                  illo communi, & quieſceret commune centrum gravitatis corporum
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                  trium; deſcriberent corpus
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                  S
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                  ex una parte, & commune centrum
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                  aliorum duorum ex altera parte, circa commune omnium centrum
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                  quieſcens, Ellipſes accuratas. </s>
                  <s>Liquet hoc per Corollarium ſecun­
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                  dum Propoſitionis LVIII collatum cum demonſtratis in Propoſ. </s>
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                  LXIV & LXV. </s>
                  <s>Perturbatur iſte motus Ellipticus aliquantulum per
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                  diſtantiam centri duorum a centro in quod tertium
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                  S
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                  attrahitur. </s>
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                  Detur præterea motus communi trium centro, & augebitur per­
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                  turbatio. </s>
                  <s>Proinde minima eſt perturbatio ubi commune trium
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                  centrum quieſcit, hoc eſt, ubi corpus intimum & maximum
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                  T
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                  lege
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                  cæterorum attrahitur: fitque major ſemper ubi trium commune il­
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                  lud centrum, minuendo motum corporis
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                  T,
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                  moveri incipit & ma­
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                  gis deinceps magiſque agitatur. </s>
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