Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1eædem a viribus acceleratricibus ad alia corpora tendentibus, aut
non urgentur niſi leviſſime, aut urgentur æqualiter & ſecundum li­
neas parallelas quamproxime.
LIBER
PRIMUS.
PROPOSITIO LXVI. THEOREMA XXVI.
Si Corpora tria, quorum Vires decreſcunt in duplicata ratione di­
ſtantiarum, ſe mutuo trahant, & attractiones acceleratrices bi­
norum quorumcunQ.E.I. tertium ſint inter ſe reciproce ut qua­
drata diſtantiarum; minora autem circa maximum revolvan­
tur: Dico quod interius circa intimum & maximum, radiis
ad ipſum ductis, deſcribet areas temporibus magis proportio­
nales, & Figuram ad formam Ellipſeos umbilicum in concur­
ſu radiorum habentis magis accedentem, ſi corpus maximum
his attractionibus agitetur, quam ſi maximum illud vel a mi­
noribus non attractum quieſcat, vel multo minus vel multo ma­
gis attractum aut multo minus aut multo magis agitetur.
Liquet fere ex demonſtratione Corollarii ſecundi Propoſitionis
præcedentis; ſed argumento magis diſtincto & latius cogente ſic
evincitur.
Cas.1. Revolvantur
107[Figure 107]
corpora minora P& S
in eodem plano circa
maximum T,quorum
Pdeſcribat Orbem in­
teriorem PAB,& S
exteriorem SE.Sit
SKmediocris diſtan­
tia corporum P& S;
& corporis Pverſus
Sattractio acceleratrix in mediocri illa diſtantia exponatur per e­
andem.
In duplicata ratione SKad SPcapiatur SLad SK,& e­
rit SLattractio acceleratrix corporis Pverſus Sin diſtantia quavis
SP.Junge PT,eique parallelam age LMoccurrentem STin M,
& attractio SLreſolvetur (per Legum Corol 2.) in attractiones
SM, LM.Et ſic urgebitur corpus Pvi acceleratrice triplici:

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