Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  DE MUNDI
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                  SYSTEMATE</s>
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                  PROPOSITIO XXXI. PROBLEMA XII.
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                  Invenire motum horarium Nodorum Lunæ in Orbe Elliptico.
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                  <s>Deſignet
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                  Qpmaq
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                  Ellipſin, axe majore
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                  Qq,
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                  minore
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                  ab
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                  de­
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                  ſcriptam,
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                  QAq
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                  Circulum circumſcriptum,
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                  T
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                  Terram in utriuſque
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                  centro communi,
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                  S
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                  Solem,
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                  p
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                  Lunam in Ellipſi motam, &
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                  pm
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                  ar­
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                  cum quem data temporis particula quam minima deſcribit,
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                  N
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                  &
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                  n
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                  Nodos linea
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                  Nn
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                  junctos,
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                  pK
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                  &
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                  mk
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                  perpendicula in axem
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                  Qq
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                  demiſſa & hinc inde producta, donec occurrant Circulo in
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                  P
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                  &
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                  M,
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                  & lineæ Nodorum in
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                  D
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                  &
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                  d.
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                  Et ſi Luna, radio ad Terram du­
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                  cto, aream deſcribat tempori proportionalem, erit motus Nodi in
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                  Ellipſi ut area
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                  pDdm.
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                  <s>Nam ſi
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                  PF
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                  tangat Circulum in
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                  P,
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                  & producta occurrat
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                  TN
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                  in
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                  F,
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                  &
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                  pf
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                  tangat Ellipſin in
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                  p
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                  & producta occurrat eidem
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                  TN
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