Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
DE MUNDI
SYSTEMATE
Conſtructionis hujus demonſtratio ex Lemmatibus conſequitur:
quippe cum recta ACſecetur in Ein ratione temporum, per
Lemma VII, ut oportet per Lem.
VIII: & BEper Lem. XI.
ſit pars rectæ BSvel Bξ in plano Eclipticæ arcui ABC&
chordæ AECinterjecta; & MP(per Corol. Lem. X.) longi­
tudo ſit chordæ arcus, quem Cometa in Orbe proprio inter ob­
ſervationem primam ac tertiam deſcribere debet, ideoQ.E.I.ſi
MNæqualis fuerit, ſi modo Bſit verus Cometæ locus in plano
Eclipticæ.
232[Figure 232]
Cæterum puncta B, b,β non quælibet, ſed vero proxima eli­
gere convenit.
Si angulus AQt,in quo veſtigium Orbis in
plano Eclipticæ deſcriptum ſecat rectam tB,præterpropter in­
noteſcat; in angulo illo ducenda erit recta occulta AC,quæ ſit
ad 4/3Tτ in ſubduplicata ratione SQad St.Et agendo rectam
SEBcujus pars EBæquetur longitudini Vt,determinabitur
punctum Bquod prima vice uſurpare licet. Tum recta ACde­
leta & ſecundum præcedentem conſtructionem iterum ducta, &

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