Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  <s>
                    <pb xlink:href="039/01/497.jpg" pagenum="466"/>
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                  octo.
                    <emph type="italics"/>
                  Jan.
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                  13 Cauda luce ſatis ſenſibili terminabatur inter
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                  Ala­
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                  mech
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                  &
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                  Algol,
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                  & luce tenuiſſima deſinebat e regione ſtellæ
                    <foreign lang="grc">χ</foreign>
                  in
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                  latere
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                  Perſei.
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                  Diſtantia termini caudæ a circulo Solem & Come­
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                  tam ungente erat 3
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                  gr.
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                  50′, & inclinatio chordæ caudæ ad circu­
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                  lum illum 8 1/2
                    <emph type="sup"/>
                  gr
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                  .
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                  Jan.
                    <emph.end type="italics"/>
                  25 & 26 luce tenui micabat ad longitu­
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                  dinem graduum 6 vel 7; & ubi cœlum valde ſerenum erat, luce
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                  tenuiſſima & ægerrime ſenſibili attingebat longitudinem graduum
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                  duodecim & paulo ultra. </s>
                  <s>Dirigebatur autem ejus axis ad Luci­
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                  dam in humero orientali Aurigæ accurate, adeoQ.E.D.clinabat ab
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                  oppoſitione Solis boream verſus in angulo graduum decem. </s>
                  <s>De­
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                  nique
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                  Feb.
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                  10 Caudam oculis armatis aſpexi gradus duos lon­
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                  gam. </s>
                  <s>Nam lux prædicta tenuior per vitra non apparuit.
                    <emph type="italics"/>
                  Pon­
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                  thæus
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                  autem
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                  Feb.
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                  7 ſe caudam ad longitudinem graduum 12
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                  vidiſſe ſcribit. </s>
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                <p type="margin">
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                    <margin.target id="note495"/>
                  DE MUNDI
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                  SYSTEMATE</s>
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                <p type="main">
                  <s>Orbem jam deſcriptum ſpectanti & reliqua Cometæ hujus Phæ­
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                  nomena in animo revolventi, haud difficulter conſtabit quod cor­
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                  pora Cometarum ſunt ſolida, compacta, fixa ac durabilia ad in­
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                  ſtar corporum Planetarum. </s>
                  <s>Nam ſi nihil aliud eſſent quam vapo­
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                  res vel exhalationes Terræ, Solis & Planetarum, Cometa hicce in
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                  tranſitu ſuo per viciniam Solis ſtatim diſſipari debuiſſet. </s>
                  <s>Eſt enim
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                  calor Solis ut radiorum denſitas, hoc eſt, reciproce ut quadratum
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                  diſtantiæ loeorum a Sole. </s>
                  <s>Ideoque cum diſtantia Cometæ a cen­
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                  tro Solis
                    <emph type="italics"/>
                  Decemb.
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                  8 ubi in Perihelio verſabatur, eſſet ad diſtan­
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                  tiam Terræ a centro Solis ut 6 ad 1000 circiter, calor Solis apud
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                  Cometam eo tempore erat ad calorem Solis æſtivi apud nos ut
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                  1000000 ad 36, ſeu 28000 ad 1. Sed calor aquæ ebullientis eſt
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                  quaſi triplo major quam calor quem terra arida concipit ad æſti­
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                  vum Solem, ut expertus ſum: & calor ferri candentis (ſi recte
                    <lb/>
                  conjector) quaſi triplo vel quadruplo major quam calor aquæ ebul­
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                  lientis; adeoque calor quem terra arida apud Cometam in Peri­
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                  helio verſantem ex radiis Solaribus concipere poſſet, quaſi 2000
                    <lb/>
                  vicibus major quam calor ferri candentis. </s>
                  <s>Tanto autem calore
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                  vapores & exhalationes, omniſque materia volatilis itatim conſumi
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                  ac diſſipari debuiſſent. </s>
                </p>
                <p type="main">
                  <s>Cometa igitur in Perihelio ſuo calorem immenſum ad Solem
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                  concepit, & calorem illum diutiſſime conſervare poteſt. </s>
                  <s>Nam
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                  globus ferri candentis digitum unum latus, calorem ſuum omnem
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                  ſpatio horæ unius in aere conſiſtens vix amitteret. </s>
                  <s>Globus autem
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                  major calorem diutius conſervaret in ratione diametri, propterea
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                  quod ſuperficies (ad cujus menſuram per contactum aeris ambi-</s>
                </p>
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