Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  PROPOSITIO XV. PROBLEMA I.
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                  Invenire Orbium principales diametros.
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                  LIBER
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                  TERTIUS.</s>
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                  <s>Capiendæ ſunt hæ in ratione ſubſeſquiplicata temporum perio­
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                  dieorum, per Prop. XV. Lib. I. deinde ſigillatim augendæ in rati­
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                  one ſummæ maſſarum Solis & Planetæ cujuſque revolventis ad
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                  primam duarum medie proportionalium inter ſummam illam &
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                  Solem, per Prop. LX. Lib. I.
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                  PROPOSITIO XVI. PROBLEMA II.
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                    <emph type="italics"/>
                  Invenire Orbium Eccentricitates & Aphelia.
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                  <s>Problema confit per Prop. XVIII. Lib. I.
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                  PROPOSITIO XVII. THEOREMA XV.
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                  Planetarum motus diurnos uniformes eſſe, & librationem Lunæ
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                  ex ipſius motu diurno oriri.
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                  <s>Patet per motus Legem I, & Corol. 22. Prop. LXVI. Lib. I.
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                  Quoniam vero Lunæ, circa axem ſuum uniformiter revolventis,
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                  dies menſtruus eſt; hujus facies eadem ulteriorem umbilicum or­
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                  bis ipſius ſemper reſpiciet, & propterea pro ſitu umbilici illius
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                  deviabit hinc inde a Terra. </s>
                  <s>Hæc eſt libratio in longitudinem.
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                  Nam libratio in latitudinem orta eſt ex inclinatione axis Lunaris
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                  ad planum orbis. </s>
                  <s>Porro hæc ita ſe habere, ex Phænomenis mani­
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                  feſtum eſt.
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                  PROPOSITIO XVIII. THEOREMA XVI.
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                  Axes Planetarum diametris quæ ad eoſdem axes normaliter du­
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                  cuntur minores eſſe.
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                  <s>Planetæ ſublato omni motu circulari diurno figuram Sphæricam,
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                  ob æqualem undique partium gravitatem, affectare deberent. </s>
                  <s>Per
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                  motum illum circularem fit ut partes ab axe recedentes juxta
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                  æquatorem aſcendere conentur. </s>
                  <s>Ideoque materia ſi fluida ſit
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