Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                <p type="main">
                  <s>
                    <pb xlink:href="039/01/470.jpg" pagenum="442"/>
                    <arrow.to.target n="note471"/>
                  dio Saturni, nunc ipſi æqualis judicabatur. </s>
                  <s>Porro cum diameter
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                  capillitii Cometarum raro ſuperet 8′ vel 12′, diameter vero nu­
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                  clei ſeu ſtellæ centralis ſit quaſi decima vel forte decima quinta
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                  pars diametri capillitii, patet Stellas haſce ut plurimum ejuſdem
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                  eſſe apparentis magnitudinis cum Planetis. </s>
                  <s>Unde cum lux earum
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                  cum luce Saturni non raro conferri poſſit, eamque aliquando ſu­
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                  peret; manifeſtum eſt quod Cometæ omnes in Periheliis vel in­
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                  fra Saturnum collocandi ſint, vel non longe ſupra. </s>
                  <s>Errant igitur
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                  toto cœlo qui Cometas in regionem Fixarum prope ablegant: qua
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                  certe ratione non magis illuſtrari deberent a Sole noſtro, quam
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                  Planetæ, qui hic ſunt, illuſtrantur a Stellis fixis. </s>
                </p>
                <p type="margin">
                  <s>
                    <margin.target id="note471"/>
                  DE MUNDI
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                  SYSTEMATE</s>
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                <p type="main">
                  <s>Hæc diſputavimus non conſiderando obſcurationem Cometa­
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                  rum per ſumum illum maxime copioſum & craſſum, quo caput
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                  circundatur, quaſi per nubem obtuſe ſemper lucens. </s>
                  <s>Nam quan­
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                  to obſcurius redditur corpus per hunc fumum, tanto propius ad
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                  Solem accedat neceſſe eſt, ut copia lucis a ſe reflexa Planetas æmu­
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                  letur. </s>
                  <s>Inde veriſimile fit Cometas longe infra ſphæram Saturni
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                  deſcendere, uti ex Parallaxi probavimus. </s>
                  <s>Idem vero quam ma­
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                  xime confirmatur ex Caudis. </s>
                  <s>Hæ vel ex reflexione fumi ſparſi
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                  per Æthera, vel ex luce capitis oriuntur. </s>
                  <s>Priore caſu minuenda
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                  eſt diſtantia Cometarum, ne fumus a capite ſemper ortus per
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                  ſpatia nimis ampla incredibili cum velocitate & expanſione pro­
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                  pagetur. </s>
                  <s>In poſteriore referenda eſt lux omnis tam caudæ quam
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                  capillitii ad nucleum capitis. </s>
                  <s>Igitur ſi concipiamus lucem hanc
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                  omnem congregari & intra diſcum nuclei coarctari, nucleus ille
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                  jam certe, quoties caudam maximam & fulgentiſſimam emittit,
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                  Jovem ipſum ſplendore ſuo multum ſuperabit. </s>
                  <s>Minore igitur
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                  cum diametro apparente plus lucis emittens, multo magis illuſtra­
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                  bitur a Sole, adeoque erit Soli multo propior. </s>
                  <s>Quinetiam capita
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                  ſub Sole deliteſcentia, & caudas cum maximas tum fulgentiſſimas
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                  inſtar trabium ignitarum nonnunquam emittentia, eodem argu­
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                  mento infra orbem Veneris collocari debent. </s>
                  <s>Nam lux illa omnis
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                  ſi in ſtellam congregari ſupponatur, ipſam Venerem ne dicam Ve­
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                  neres plures conjunctas quandoque ſuperaret. </s>
                </p>
                <p type="main">
                  <s>Idem denique colligitur ex luce capitum creſcente in receſſu
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                  Cometarum a Terra Solem verſus, ac decreſcente in eorum receſſu
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                  a Sole verſus Terram. </s>
                  <s>Sic enim Cometa poſterior Anni 1665
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                  (obſervante
                    <emph type="italics"/>
                  Hevelio,
                    <emph.end type="italics"/>
                  ) ex quo conſpici cœpit, remittebat ſemper </s>
                </p>
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