Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1ter ſe in ultima proportione Sinuum vel Tangentium angulorum
contactuum ad radios æquales pertinentium, ubi radii illi in infi­
nitum diminuuntur.
Attractio autem Lunæ in Terram in Syzy­
giis eſt exceſſus gravitatis ipſius in Terram ſupra vim Solarem
2 PK(Vide Figur. pag.394) qua gravitas acceleratrix Lunæ in
Solem ſuperat gravitatem acceleratricem Terræ in Solem.
In Qua­
draturis autem attractio illa eſt ſumma gravitatis Lunæ in Terram
& vis Solaris KT,qua Luna in Terram trahitur. Et hæ attra­
ctiones, ſi (AT+CT/2) dicatur N, ſunt ut (178725/ATq)-(2000/CTXN) &
(178725/CIq)+(1000/ATXN) quam proxime; ſeu ut 178725NXCTq
-2000 ATqXCT& 178725 NXATq+1000 CTqXAT.Nam
ſi gravitas acceleratrix Lunæ in Terram exponatur per numerum
178725, vis mediocris ML,quæ in Quadraturis eſt PTvel
TK& Lunam trahit in Ter­
208[Figure 208]
ram, erit 1000, & vis me­
diocris TMin Syzygiis erit
3000; de qua, ſi vis medio­
cris MLſubducatur, mane­
bit vis 2000 qua Luna in
Syzygiis diſtrahitur a Terra,
quamque jam ante nominavi
2 PK.Velocitas autem Lu­
næ in Syzygiis A& Beſt ad
ipſius velocitatem in Qua­
draturis C& D,ut CTad
AT& momentum areæ quam
Luna radio ad Terram du­
cto deſcribit in Syzygiis ad
momentum ejuſdem areæ in
Quadraturis conjunctim; i.e.

ut 11073 CTad 10973 AT.
Sumatur hæc ratio bis in­
verſe & ratio prior ſemel directe, & fiet curvatura Orbis Lu­
naris in Syzygiis ad ejuſdem curvaturam in Quadraturis ut
120406729X178725 ATqXCTqXN-120406729X2000 ATqq
XCTad 122611329X178725 ATqXCTqXN+122611329X
1000 CTqqXAT, i.e.ut 2151969 ATXCTXN-24081 AT cub.
ad 2191371 ATXCTXN+12261 CT cub.

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