Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  PROPOSITIONES.
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                  PROPOSITIO I. THEOREMA I.
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                  DE MUNDI
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                  SYSTEMATE</s>
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                  Vires, quibus Planetæ Circumjoviales perpetuo retrahuntur à me­
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                  tibus rectilineis & in Orbibus ſuis retinentur, reſpicere cen­
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                  trum Jovis, & eſſe reciproce ut quadrata diſtantiarum loco­
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                  rum ab eodem centro.
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                  <s>PAtet pars prior Propoſitionis per Phænomenon primum, &
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                  Propoſitionem ſecundam vel tertiam Libri primi: & pars
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                  poſterior per Phænomenon primum, & Corollarium ſextum Pro­
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                  poſitionis quartæ ejuſdem Libri.
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                  <s>Idem intellige de Planetis qui Saturnum comitantur, per Phæ­
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                  nomenon ſecundum.
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                  PROPOSITIO II. THEOREMA II.
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                  Vires, quibus Planetæ primarii perpetuo retrahuntur à motibus
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                  rectilineis, & in Orbibus ſuis retinentur, reſpicere Solem, &
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                  eſſe reciproce ut quadrata diſtantiarum ab ipſius centro.
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                  <s>Patet pars prior Propoſitionis per Phænomenon quintum, &
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                  Propoſitionem ſecundam Libri primi: & pars poſterior per Phæ­
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                  nomenon quartum, & Propoſitionem quartam ejuſdem Libri.
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                  Accuratiſſime autem demonſtratur hæc pars Propoſitionis per
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                  quietem Apheliorum. </s>
                  <s>Nam aberratio quam minima à ratione
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                  duplicata (per Corol. 1. Prop. XLV. Lib. I.) motum Apſidum in
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                  ſingulis revolutionibus notabilem, in plunibus enormem efficere
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                  deberet.
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