Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  DE MOTU
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                  CORPORUM</s>
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                <p type="main">
                  <s>
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                  PROPOSITIO LVII. THEOREMA XX.
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                  <s>
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                  Corpora duo ſe invicem trahentia deſcribunt, & circum commune
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                  centrum gravitatis, & circum ſe mutuo, Figuras ſimiles.
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                    <emph.end type="center"/>
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                  <s>Sunt enim diſtantiæ a communi gravitatis centro reciproce pro­
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                  portionales corporibus, atque adeo in data ratione ad invicem, &
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                  componendo, in data ratione ad diſtantiam totam inter corpora. </s>
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                  Feruntur autem hæ diſtantiæ circum terminos ſuos communi motu
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                  angulari, propterea quod in directum ſemper jacentes non mutant
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                  inclinationem ad ſe mutuo. </s>
                  <s>Lineæ autem rectæ, quæ ſunt in data
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                  ratione ad invicem, & æquali motu angulari circum terminos ſuos
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                  feruntur, Figuras circum eoſdem terminos (in planis quæ una cum
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                  his terminis vel quieſcunt vel motu quovis non angulari moven­
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                  tur) deſcribunt omnino ſimiles. </s>
                  <s>Proinde ſimiles ſunt Figuræ quæ
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                  his diſtantiis circumactis deſcribuntur.
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                  Q.E.D.
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                  </s>
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                <p type="main">
                  <s>
                    <emph type="center"/>
                  PROPOSITIO LVIII. THEOREMA XXI.
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                  </s>
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                <p type="main">
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                  Si corpora duo Viribus quibuſvis ſe mutuo trahunt, & interea re­
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                  volvuntur circa gravitatis centrum commune: dico quod Fi­
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                  guris, quas corpora ſic mota deſcribunt circum ſe mutuo, potest
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                  Figura ſimilis & æqualis, circum corpus alterutrum immotum,
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                  Viribus iiſdem deſcribi.
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                  </s>
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                <p type="main">
                  <s>Revolvantur corpora
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                  S, P
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                  circa commune gravitatis centrum
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                    <emph type="italics"/>
                  C,
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                  pergendo de
                    <emph type="italics"/>
                  S
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                  ad
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                  T
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                  deque
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                  P
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                  ad
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                    <expan abbr="q.">que</expan>
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                  A dato puncto
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                  s
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                  ipſis
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                    <figure id="id.039.01.176.1.jpg" xlink:href="039/01/176/1.jpg" number="104"/>
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                    <emph type="italics"/>
                  SP, TQ
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                  æquales & parallelæ ducantur ſemper
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                  sp, sq
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                  ; & Curva
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                    <emph type="italics"/>
                  pqv
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                  quam punctum
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                  p,
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                  revolvendo circum punctum immotum
                    <emph type="italics"/>
                  s,
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                  </s>
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