Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  DE MUNDI
                    <lb/>
                  SYSTEMATE</s>
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                <p type="main">
                  <s>Conſtructionis hujus demonſtratio ex Lemmatibus conſequitur:
                    <lb/>
                  quippe cum recta
                    <emph type="italics"/>
                  AC
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                  ſecetur in
                    <emph type="italics"/>
                  E
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                  in ratione temporum, per
                    <lb/>
                  Lemma VII, ut oportet per Lem. </s>
                  <s>VIII: &
                    <emph type="italics"/>
                  BE
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                  per Lem. </s>
                  <s>XI.
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                  ſit pars rectæ
                    <emph type="italics"/>
                  BS
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                  vel
                    <emph type="italics"/>
                  B
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                    <foreign lang="grc">ξ</foreign>
                  in plano Eclipticæ arcui
                    <emph type="italics"/>
                  ABC
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                  &
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                  chordæ
                    <emph type="italics"/>
                  AEC
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                  interjecta; &
                    <emph type="italics"/>
                  MP
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                  (per Corol. </s>
                  <s>Lem. </s>
                  <s>X.) longi­
                    <lb/>
                  tudo ſit chordæ arcus, quem Cometa in Orbe proprio inter ob­
                    <lb/>
                  ſervationem primam ac tertiam deſcribere debet, ideoQ.E.I.ſi
                    <lb/>
                    <emph type="italics"/>
                  MN
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                  æqualis fuerit, ſi modo
                    <emph type="italics"/>
                  B
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                  ſit verus Cometæ locus in plano
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                  Eclipticæ. </s>
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                  <s>Cæterum puncta
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                  B, b,
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                    <foreign lang="grc">β</foreign>
                  non quælibet, ſed vero proxima eli­
                    <lb/>
                  gere convenit. </s>
                  <s>Si angulus
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                  AQt,
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                  in quo veſtigium Orbis in
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                  plano Eclipticæ deſcriptum ſecat rectam
                    <emph type="italics"/>
                  tB,
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                  præterpropter in­
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                  noteſcat; in angulo illo ducenda erit recta occulta
                    <emph type="italics"/>
                  AC,
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                  quæ ſit
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                  ad 4/3
                    <emph type="italics"/>
                  T
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                    <foreign lang="grc">τ</foreign>
                  in ſubduplicata ratione
                    <emph type="italics"/>
                  SQ
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                  ad
                    <emph type="italics"/>
                  St.
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                  Et agendo rectam
                    <lb/>
                    <emph type="italics"/>
                  SEB
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                  cujus pars
                    <emph type="italics"/>
                  EB
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                  æquetur longitudini
                    <emph type="italics"/>
                  Vt,
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                  determinabitur
                    <lb/>
                  punctum
                    <emph type="italics"/>
                  B
                    <emph.end type="italics"/>
                  quod prima vice uſurpare licet. </s>
                  <s>Tum recta
                    <emph type="italics"/>
                  AC
                    <emph.end type="italics"/>
                  de­
                    <lb/>
                  leta & ſecundum præcedentem conſtructionem iterum ducta, & </s>
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