Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  dari & propius ad Solem accedere: & ſingulis revolutionibus ac­
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                    <arrow.to.target n="note510"/>
                  cedendo ad Solem, incidet is tandem in corpus Solis. </s>
                  <s>Sed & in
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                  Aphelio ubi tardiſſime movetur, aliquando per attractionem alio­
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                  rum Cometarum retardari poteſt & ſubinde in Solem incidere. </s>
                  <s>
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                  Sic etiam Stellæ fixæ quæ paulatim expirant in lucern & vapores,
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                  Cometis in ipſas incidentibus refici poſſunt, & novo alimento
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                  accenſæ pro Stellis Novis haberi. </s>
                  <s>Vapores autem qui ex Sole &
                    <lb/>
                  Stellis fixis & caudis Cometarum oriuntur, incidere poſſunt per
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                  gravitatem ſuam in Atmoſphæras Planetarum, & ibi condenſari
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                  & converti in aquam & ſpiritus humidos, & ſubinde per lentum
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                  calorem in ſales, & ſulphura, & tincturas, & limum, & lutum, &
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                  argillam, & arenam, & lapides, & coralla, & ſubſtantias alias
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                  terreſtres paulatim migrare. </s>
                  <s>Decreſcente autem corpore Solis
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                  motus medii Planetarum circum Solem paulatim tardeſcent, &
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                  creſcente Terra motus medius Lunæ circum Terram paulatim au­
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                  gebitur. </s>
                  <s>Et collatis quidem obſervationibus Eclipſium
                    <emph type="italics"/>
                  BabyloNI­
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                  cis
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                  cum iis
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                  Albategnii
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                  & cum hodiernis,
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                  Halleius
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                  noſter motum
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                  medium Lunæ cum motu diurno Terræ collatum, paulatim acce­
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                  lerari, primus omnium quod ſciam deprehendit. </s>
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                  LIBER
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                  TERTIUS.</s>
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                  SCHOLIUM GENERALE.
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                    <emph.end type="center"/>
                  </s>
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                  <s>Hypotheſis Vorticum multis premitur difficultatibus. </s>
                  <s>Ut Pla­
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                  neta unuſquiſque radio ad Solem ducto areas deſcribat tempori
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                  proportionales, tempora periodica partium Vorticis deberent eſſe
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                  in duplicata ratione diſtantiarum a Sole. </s>
                  <s>Ut periodica Plane­
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                  tarum tempora ſint in proportione ſeſquiplicata diſtantiarum a
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                  Sole, tempora periodica partium Vorticis deberent eſſe in eadem
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                  diſtantiarum proportione. </s>
                  <s>Ut Vortices minores circum Satur­
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                  num, Jovem & alios Planetas gyrati conſerventur & tranquille
                    <lb/>
                  natent in Vortice Solis, tempora periodica partium Vorticis So­
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                  laris deberent eſſe æqualia. </s>
                  <s>Revolutiones Solis & Planetarum cir­
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                  cum axes ſuos ab omnibus hiſce proportionibus diſcrepant. </s>
                  <s>Mo­
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                  tus Cometarum ſunt ſumme regulares, & eaſdem leges cum Pla­
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                  netarum motibus obſervant, & per Vortices explicari nequeunt. </s>
                  <s>
                    <lb/>
                  Feruntur Cometæ motibus valde eccentricis in omnes cælorum
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                  partes, quod fieri non poteſt niſi Vortices tollantur. </s>
                </p>
                <p type="main">
                  <s>Projectilia, in aere noſtro, ſolam aeris reſiſtentiam ſentiunt. </s>
                  <s>
                    <lb/>
                  Sublato aere, ut fit in Vacuo
                    <emph type="italics"/>
                  Boyliano,
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                  reſiſtentia ceſſat, ſiqui­
                    <lb/>
                  dem pluma tenuis & aurum ſolidum æquali cum velocitate in hoc </s>
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