Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1Apogæo Solis, Variatio maxima eſt 33′. 14″, & in ejus Perigæo
37′.
11″, ſi modo Eccentricitas Solis ſit ad Orbis magni ſemidia­
metrum tranſverſam ut (16 15/16) ad 1000.
LIBER
TERTIUS.
Hactenus Variationem inveſtigavimus in Orbe non eccentrico,
in quo utique Luna in Octantibus ſuis ſemper eſt in mediocri ſua
diſtantia a Terra.
Si Luna propter eccentricitatem ſuam, magis
vel minus diſtat a Terra quam ſi locaretur in hoc Orbe, Variatio
paulo major eſſe poteſt vel paulo minor quam pro Regula hic
allata: ſed exceſſum vel defectum ab Aſtronomis per Phænomena
determinandum relinquo.
PROPOSITIO XXX. PROBLEMA XI.
Invenire motum borarium Nodorum Lunæ in Orbe circulari.
Deſignet SSolem, TTerram, PLunam, NPnOrbem Lunæ,
Npnveſtigium Orbis in plano Eclipticæ; N, nNodos, nTNm
211[Figure 211]
lineam Nodorum infinite productam; PI, PKperpendicula de­
miſſa in lineas ST, Qque Ppperpendiculum demiſſum in planum

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