Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  PROPOSITIO V. THEOREMA V.
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                  LIBER
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                  TERTIUS.</s>
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                  Planetas Circumjoviales gravitare in Jovem, Circumſaturnios in
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                  Saturnum, & Circumſolares in Solem, & vi gravitatis ſuæ
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                  retrahi ſemper à motibus rectilineis, & in Orbibus curvili­
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                  neis retineri.
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                  <s>Nam revolutiones Planetarum Circumjovialium circa Jovem, Cir­
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                  cumſaturniorum circa Saturnum, & Mercurii ac Veneris reliquo­
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                  rumque Circumſolarium circa Solem ſunt Phænomena ejuſdem ge­
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                  neris cum revolutione Lunæ circa Terram; & propterea per
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                  Reg. 11. à cauſis ejuſdem generis dependent: præſertim cum de­
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                  monſtratum ſit quod vires, à quibus revolutiones illæ dependent,
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                  reſpiciant centra Jovis, Saturni ac Solis, & recedendo à Jove, Sa­
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                  turno & Sole decreſcant eadem ratione ac lege, qua vis gravitatis
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                  decreſcit in receſſu à Terra.
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                  Corol.
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                  1. Gravitas igitur datur in Planetas univerſos. </s>
                  <s>Nam Ve­
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                  nerem, Mercurium, cæteroſque eſſe corpora ejuſdem generis cum
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                  Jove & Saturno, nemo dubitat. </s>
                  <s>Et cum attractio omnis (per mo­
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                  tus Legem tertiam) mutua ſit, Jupiter in Satellites ſuos omnes,
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                  Saturnus in ſuos, TerraQ.E.I. Lunam, & Sol in Planetas omnes
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                  primarios gravitabit.
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                  Corol.
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                  2. Gravitatem, quæ Planetam unumquemque reſpicit, eſſe
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                  reciproce ut quadratum diſtantiæ loeorum ab ipſius centro.
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                  Corol.
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                  3. Graves ſunt Planetæ omnes in ſe mutuo per Corol. 1.
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                  & 2. Et hinc Jupiter & Saturnus prope conjunctionem ſe invicem
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                  attrahendo, ſenſibiliter perturbant motus mutuos, Sol perturbat
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                  motus Lunares, Sol & Luna perturbant Mare noſtrum, ut in
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                  ſequentibus explicabitur.
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                  PROPOSITIO VI. THEOREMA VI.
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                  Corpora omnia in Planetas ſingulos gravitare, & pondera eorum
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                  in eundem quemvis Planetam, paribus diſtantiis à centro Pla­
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                  netæ, proportionalia eſſe quantitati materiæ in ſingulis.
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                  <s>Deſcenſus gravium omnium in Terram (dempta ſaltem inæquali
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                  retardatione quæ ex Aeris perexigua reſiſtentia oritur) æqualibus
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                  </s>
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