Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  de motu ſuo apparente, adeoque præterierat Perigæum; Splen­
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                  dor vero capitis nihilominus indies creſcebat, uſQ.E.D.m Cometa
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                  radiis Solaribus obtectus deſiit apparere. </s>
                  <s>Cometa Anni 1683,
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                  obſervante eodem
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                  Hevelio,
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                  in fine Menſis
                    <emph type="italics"/>
                  Julii
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                  ubi primum con­
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                  ſpectus eſt, tardiſſime movebatur, minuta prima 40 vel 45 circi­
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                  ter ſingulis diebus in Orbe ſuo conficiens. </s>
                  <s>Ex eo tempore motus
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                  ejus diurnus perpetuo augebatur uſque ad
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                  Sept.
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                  4. quando evaſit
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                  graduum quaſi quinque. </s>
                  <s>Igitur toto hoc tempore Cometa ad
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                  Terram appropinquabat. </s>
                  <s>Id quod etiam ex diametro capitis
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                  Micrometro menſurata colligitur: quippe quam
                    <emph type="italics"/>
                  Hevelius
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                  reperit
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                    <emph type="italics"/>
                  Aug.
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                  6. eſſe tantum 6′. </s>
                  <s>5″ incluſa coma, at
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                  Sept.
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                  2. eſſe 9′. </s>
                  <s>7″. </s>
                  <s>
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                  Caput igitur initio longe minus apparuit quam in ſine motus, at
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                  initio tamen in vicinia Solis longe lucidius extitit quam circa
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                  finem, ut refert idem
                    <emph type="italics"/>
                  Hevelius.
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                  Proinde toto hoc tempore, ob
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                  receſſum ipſius a Sole, quoad lumen decrevit, non obſtante ac­
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                  ceſſu ad Terram. </s>
                  <s>Cometa Anni 1618 circa medium Menſis
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                  De­
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                  cembris,
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                  & iſte Anni 1680 circa finem ejuſdem Menſis, celerrime
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                  movebantur, adeoque tunc erant in Perigæis. </s>
                  <s>Verum ſplendor
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                  maximus capitum contigit ante duas fere ſeptimanas, ubi modo
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                  exierant de radiis Solaribus; & ſplendor maximus caudarum
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                  paulo ante, in majore vicinitate Solis. </s>
                  <s>Caput Cometæ prioris,
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                  juxta obſervationes
                    <emph type="italics"/>
                  Cyſati, Decemb.
                    <emph.end type="italics"/>
                  1. majus videbatur ſtellis pri­
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                  mæ magnitudinis, &
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                  Decemb.
                    <emph.end type="italics"/>
                  16. (jam in Perigæo exiſtens) mag­
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                  nitudine parum, ſplendore ſeu claritate luminis plurimum defe­
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                  cerat.
                    <emph type="italics"/>
                  Jan.
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                  7.
                    <emph type="italics"/>
                  Keplerus
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                  de capite incertus finem fecit obſervandi. </s>
                  <s>
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                  Die 12 menſis
                    <emph type="italics"/>
                  Decemb.
                    <emph.end type="italics"/>
                  conſpectum & a
                    <emph type="italics"/>
                  Flamſtedio
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                  obſervatum
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                  eſt caput Cometæ poſterioris, in diſtantia novem graduum a Sole;
                    <lb/>
                  id quod ſtellæ tertiæ magnitudinis vix conceſſum fuiſſet.
                    <emph type="italics"/>
                  Decemb.
                    <emph.end type="italics"/>
                    <lb/>
                  15. & 17 apparuit idem ut ſtella tertiæ magnitudinis, diminutum
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                  utique ſplendore Nubium juxta Solem occidentem.
                    <emph type="italics"/>
                  Decemb.
                    <emph.end type="italics"/>
                  26.
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                  velociſſime motus, inque Perigæo propemodum exiſtens, cedebat
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                  ori Pegaſi, Stellæ tertiæ magnitudinis.
                    <emph type="italics"/>
                  Jan.
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                  3. apparebat ut Stella
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                  quartæ,
                    <emph type="italics"/>
                  Jan.
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                  9. ut Stella quintæ,
                    <emph type="italics"/>
                  Jan.
                    <emph.end type="italics"/>
                  13. ob ſplendorem Lunæ
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                  creſcentis diſparuit.
                    <emph type="italics"/>
                  Jan.
                    <emph.end type="italics"/>
                  25. vix æquabat Stellas magnitudinis
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                  ſeptimæ. </s>
                  <s>Si ſumantur æqualia a Perigæo hinc inde tempora, ca­
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                  pita quæ temporibus illis in longinquis regionibus poſita, ob
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                  æquales a Terra diſtantias, æqualiter lucere debuiſſent, in plaga
                    <lb/>
                  Solis maxime ſplenduere, ex altera Perigæi parte evanuere. </s>
                  <s>Igi­
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                  tur ex magna lucis in utroque ſitu differentia, concluditur magna
                    <lb/>
                  Solis & Cometæ vicinitas in ſitu priore. </s>
                  <s>Nam lux Cometarum </s>
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