Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  Jovis in Solem ut 65 ad 124986 ſeu 1 ad 1923. Huic autem dif­
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                  ferentiæ proportionalis eſt maxima Saturni efficacia ad perturban­
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                  dum motum Jovis, & propterea perturbatio orbis Jovialis longe
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                  minor eſt quam ea Saturnii. </s>
                  <s>Reliquorum orbium perturbationes
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                  ſunt adhuc longe minores, præterquam quod Orbis Terræ ſenſi­
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                  biliter perturbatur a Luna. </s>
                  <s>Commune centrum gravitatis Terræ
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                  & Lunæ, Ellipſin circum Solem in umbilico poſitum percurrit, &
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                  radio ad Solem ducto areas in eadem temporibus proportionales
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                  deſcribit, Terra vero circum hoc centrum commune motu men­
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                  ſtruo revolvitur.
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                  PROPOSITIO XIV. THEOREMA XIV.
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                    <emph type="italics"/>
                  Orbium Aphelia & Nodi quieſcunt.
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                  DE MUNDI
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                  SYSTEMATE</s>
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                  <s>Aphelia quieſcunt, per Prop. XI. Lib. I. ut & Orbium plana,
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                  per ejuſdem Libri Prop. 1. & quieſcentibus planis quieſcunt Nodi.
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                  Attamen a Planetarum revolventium & Cometarum actionibus in
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                  ſe invicem orientur inæqualitates aliquæ, ſed quæ ob parvitatem
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                  hic contemni poſſunt.
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                  </s>
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                  <s>
                    <emph type="italics"/>
                  Corol.
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                  1. Quieſcunt etiam Stellæ fixæ, propterea quod datas ad
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                  Aphelia Nodoſque poſitiones ſervant.
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                  </s>
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                <p type="main">
                  <s>
                    <emph type="italics"/>
                  Corol.
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                  2. Ideoque cum nulla ſit earum parallaxis ſenſibilis ex
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                  Terræ motu annuo oriunda, vires earum ob immenſam corporum
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                  diſtantiam nullos edent ſenſibiles effectus in regione Syſtematis
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                  noſtri. </s>
                  <s>Quinimo Fixæ in omnes cæli partes æqualiter diſperſæ
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                  contrariis attractionibus vires mutuas deſtruunt, per Prop. LXX.
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                  Lib. I.
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                    <emph type="italics"/>
                  Scholium.
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                  </s>
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                  <s>Cum Planetæ Soli propiores (nempe Mercurius, Venus, Terra,
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                  & Mars) ob corporum parvitatem parum agant in ſe invicem:
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                  horum Aphelia & Nodi quieſcent, niſi quatenus a viribus Jovis,
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                  Saturni, & corporum ſuperiorum turbentur. </s>
                  <s>Et inde colligi po­
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                  teſt per theoriam gravitatis, quod horum Aphelia moventur ali­
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                  quantulum in conſequentia reſpectu fixarum, idQ.E.I. proporti­
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                  one ſeſquiplicata diſtantiarum horum Planetarum a Sole. </s>
                  <s>Ut ſi
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                  Aphelium Martis in annis centum conficiat 35′ in conſequentia
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                  reſpectu fixarum; Aphelia Terræ, Veneris, & Mercurii in annis
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                  centum conficient 18′. 36″, 11′. 27″, & 4′. 29″ reſpective. </s>
                  <s>Et hi
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                  motus, ob parvitatem, negliguntur in hac Propoſitione.
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                  </s>
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