Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  DE MUNDI
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                  SYSTEMATE</s>
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                  LEMMA III.
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                  Iiſdem poſitis: Dico tertio quod motus Terræ totius circum axem
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                  jam ante deſcriptum, ex motibus particularum omnium compoſi­
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                  tus, erit ad motum annuli prædicti circum axem eundem, in ra­
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                  tione quæ componitur ex ratione materiæ in Terra ad materiam
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                  in annulo, & ratione trium quadratorum ex arcu quadrantali
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                  circuli cujuſcunque ad duo quadrata ex diametro; id eſt, in ra­
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                  tione materiæ ad materiam & numeri
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                  925275
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                  ad numerum
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                  1000000. </s>
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                  <s>Eſt enim motus Cylindri circum axem ſuum immotum revol­
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                  ventis, ad motum Sphæræ inſcriptæ & ſimul revolventis, ut quæ­
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                  libet quatuor æqualia quadrata ad tres ex circulis ſibi inſcriptis:
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                  & motus Cylindri ad motum annuli tenuiſſimi, Sphæram & Cy­
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                  lindrum ad communem eorum contactum ambientis, ut duplum
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                  materiæ in Cylindro ad triplum materiæ in annulo; & annuli
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                  motus iſte circum axem Cylindri uniformiter continuatus, ad
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                  ejuſdem motum uniformem circum diametrum propriam, eodem
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                  tempore periodico factum, ut circumferentia circuli ad duplum
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                  diametri. </s>
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                  HYPOTHESIS II.
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                  Si annulus prædictus Terra omni reliqua ſublata, ſolus in Orbe
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                  Terræ, motu annuo circa Solem ferretur, & interea circa axem
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                  ſuum, ad planum Eclipticæ in angulo graduum
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                  23 1/2
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                  inclinatum,
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                  motu diurno revolveretur: idem foret motus Punctorum Æqui­
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                  noctialium ſive annulus iſte fluidus eſſet, ſive is ex materia rigida
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                  & firma conſtaret.
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