Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  DE MUNDI
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                  SYSTEMATE</s>
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                  PROPOSITIO XXI. THEOREMA XVII.
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                  Puncta Æquinoctialia regredi, & axem Terræ ſingulis revoluti­
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                  onibus annuis nutando bis inclinari in Eclipticam & bis re­
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                  dire ad poſitionem priorem.
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                  <s>Patet per Corol. </s>
                  <s>20. Prop. </s>
                  <s>LXVI. Lib. </s>
                  <s>I. </s>
                  <s>Motus tamen iſte
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                  nutandi perexiguus eſſet debet, & vix aut ne vix quidem ſen­
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                  ſibilis. </s>
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                  PROPOSITIO XXII. THEOREMA XVIII.
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                  Motus omnes Lunares, omneſque motuum inæqualitates ex alla­
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                  tis Principiis conſequi.
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                  <s>Planetas majores, interea dum circa Solem feruntur, poſſe alios
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                  minores circum ſe revolventes Planetas deferre, & minores illos in
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                  Ellipſibus, umbilicos in centris majorum habentibus, revolvi de­
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                  bere patet per Prop. </s>
                  <s>LXV. Lib. </s>
                  <s>I. </s>
                  <s>Actione autem Solis perturba­
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                  buntur eorum motus multimode, iiſque adficientur inæqualitati­
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                  bus quæ in Luna noſtra notantur. </s>
                  <s>Hæc utique (per Corol. </s>
                  <s>2,
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                  3, 4, & 5. Prop. </s>
                  <s>LXVI.) velocius movetur, ac radio ad Terram
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                  ducto deſcribit aream pro tempore majorem, Orbemque habet
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                  minus curvum, atque adeo propius accedit ad Terram, in Syzygiis
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                  quam in Quadraturis, niſi quatenus impedit motus Eccentricitatis. </s>
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                  Eccentricitas enim maxima eſt (per Corol. </s>
                  <s>9. Prop. </s>
                  <s>LXVI.) ubi
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                  Apogæum Lunæ in Syzygiis verſatur, & minima ubi idem in Qua­
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                  draturis conſiſtit; & inde Luna in Perigæo velocior eſt & nobis
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                  propior, in Apogæo autem tardior & remotior in Syzygiis quam
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                  in Quadraturis. </s>
                  <s>Progreditur inſuper Apogæum, & regrediuntur
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                  Nodi, ſed motu inæquabili. </s>
                  <s>Et Apogæum quidem (per Corol. </s>
                  <s>7.
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                  & 8. Prop. </s>
                  <s>LXVI.) velocius progreditur in Syzygiis ſuis, tardius
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                  regreditur in Quadraturis, & exceſſu progreſſus ſupra regreſſum
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                  annuatim fertur in conſequentia. </s>
                  <s>Nodi autem (per Corol. </s>
                  <s>11.
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                  Prop. </s>
                  <s>LXVI.) quieſcunt in Syzygiis ſuis, & velociſſime regrediun­
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                  tur in Quadraturis. </s>
                  <s>Sed & major eſt Lunæ latitudo maxima in
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                  ipſius Quadraturis (per Corol. </s>
                  <s>10. Prop. </s>
                  <s>LXVI.) quam in Syzy­
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                  giis: & motus medius tardior in Perihelio Terræ (per Corol. </s>
                  <s>6. </s>
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