Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  progrediente, centrum Mundi quoque movebitur contra Hy­
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                  potheſin.
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                  PROPOSITIO XII. THEOREMA XII.
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                  DE MUNDI
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                  SYSTEMATE</s>
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                  Solem motu perpetuo agitari, ſed nunquam longe recedere a com­
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                  muni gravitatis centro Planetarum omnium.
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                  <s>Nam cum (per Corol. 2. Prop. VIII.) materia in Sole ſit ad
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                  materiam in Jove ut 1033 ad 1, & diſtantia Jovis a Sole ſit ad
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                  ſemidiametrum Solis in ratione paulo majore; incidet commune
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                  centrum gravitatis Jovis & Solis in punctum paulo ſupra ſuper­
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                  ficiem Solis. </s>
                  <s>Eodem argumento cum materia in Sole ſit ad ma­
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                  teriam in Saturno ut 2411 ad 1, & diſtantia Saturni a Sole ſit ad
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                  ſemidiametrum Solis in ratione paulo minore: incidet commune
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                  centrum gravitatis Saturni & Solis in punctum paulo infra ſuper­
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                  ficiem Solis. </s>
                  <s>Et ejuſdem calculi veſtigiis inſiſtendo ſi Terra &
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                  Planetæ omnes ex una Solis parte conſiſterent, commune omnium
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                  centrum gravitatis vix integra Solis diametro a centro Solis di­
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                  ſtaret. </s>
                  <s>Aliis in caſibus diſtantia centrorum ſemper minor eſt.
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                  Et propterea cum centrum illud gravitatis perpetuo quieſcit, Sol
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                  pro vario Planetarum ſitu in omnes partes movebitur, ſed à cen­
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                  tro illo nunquam longe recedet.
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                  Corol.
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                  Hinc commune gravitatis centrum Terræ, Solis & Pla­
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                  netarum omnium pro centro Mundi habendum eſt. </s>
                  <s>Nam cum
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                  Terra, Sol & Planetæ omnes gravitent in ſe mutuo, & propte­
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                  rea, pro vi gravitatis ſuæ, ſecundum leges motus perpetuo agi­
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                  tentur: perſpicuum eſt quod horum centra mobilia pro Mundi
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                  centro quieſcente haberi nequeunt. </s>
                  <s>Si corpus illud in centro
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                  locandum eſſet in quod corpora omnia maxime gravitant (uti
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                  vulgi eſt opinio) privilegium iſtud concedendum eſſet Soli.
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                  Cum autem Sol moveatur, eligendum erit punctum quieſcens,
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                  a quo centrum Solis quam minime diſcedit, & a quo idem ad­
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                  huc minus diſcederet, ſi modo Sol denſior eſſet & major, ut
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                  minus moveretur.
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