Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  LEMMA IV.
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                  LIBER
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                  TERTIUS.</s>
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                  Cometas eſſe Luna ſuperiores & in regione Planetarum verſari.
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                    <emph.end type="center"/>
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                  <s>Ut defectus Parallaxeos diurnæ extulit Cometas ſupra regiones
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                  ſublunares, ſic ex Parallaxi annua convincitur eorum deſcenſus in
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                  regiones Planetarum. </s>
                  <s>Nam Cometæ qui progrediuntur ſecun­
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                  dum ordinem ſignorum ſunt omnes, ſub exitu apparitionis, aut
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                  ſolito tardiores aut retrogradi, ſi Terra eſt inter ipſos & Solem;
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                  at juſto celeriores ſi Terra vergit ad oppoſitionem. </s>
                  <s>Et e contra,
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                  qui pergunt contra ordinem ſignorum ſunt juſto celeriores in fine
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                  apparitionis, ſi Terra verſatur inter ipſos & Solem; & juſto tar­
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                  diores vel retrogradi ſi Terra ſita eſt ad contrarias partes. </s>
                  <s>Con­
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                  tingit hoc maxime ex motu Terræ in vario ipſius ſitu, perinde ut
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                  fit in Planetis, qui, pro motu Terræ vel conſpirante vel contra­
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                  rio, nunc retrogradi ſunt, nunc tardius progredi videntur, nunc
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                  vero celerius. </s>
                  <s>Si Terra pergit ad eandem partem cum Cometa,
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                  & motu angulari circa Solem tanto celerius fertur, ut recta per
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                  Terram & Cometam perpetuo ducta convergat ad partes ultra
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                  Cometam, Cometa e Terra ſpectatus, ob motum ſuum tardiorem,
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                  apparet eſſe retrogradus; ſin Terra tardius fertur, motus Cometæ,
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                    <figure id="id.039.01.467.1.jpg" xlink:href="039/01/467/1.jpg" number="225"/>
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                  (detracto motu Terræ) fit ſaltem tardior. </s>
                  <s>At ſi Terra pergit in
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                  contrarias partes, Cometa exinde velocior apparet. </s>
                  <s>Ex accele­
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                  ratione autem vel retardatione vel motu retrogrado diſtantia Co­
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                  metæ in hunc modum colligitur. </s>
                  <s>Sunto
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                  r QA, r QB, r QC
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                  obſervatæ tres longitudines Cometæ, ſub initio motus, ſitque
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                    <emph type="italics"/>
                  r QF
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                  longitudo ultimo obſervata, ubi Cometa videri deſinit. </s>
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