Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1ctionibus diſtinguet Radium ASin partes AS, BS, CS, DS,&c.
continue proportionales.
Revolutionum vero tempora erunt ut
167[Figure 167]
perimetri Orbitarum AEB, BFC, CGD,&c. directe, & veloci­
tates in principiis A, B, C,inverſe; id eſt, ut AS1/2, BS1/2, CS1/2. At­
que tempus totum, quo corpus perveniet ad centrum, erit ad tem­
pus revolutionis primæ, ut ſumma omnium continue proportiona­
lium AS1/2, BS1/2, CS1/2 pergentium in infinitum, ad terminum pri­
mum AS1/2; id eſt, ut terminus ille primus AS1/2 ad differentiam du­
orum primorum AS1/2-BS1/2, ſive ut 2/3ASad ABquam proxime.
Unde tempus illud totum expedite invenitur.
LIBER
SECUNDUS.
Corol.8. Ex his etiam præter propter colligere licet motus cor­
porum in Mediis, quorum denſitas aut uniformis eſt, aut aliam
quamcunque legem aſſignatam obſervat.
Centro S,intervallis con­
tinue proportionalibus SA, SB, SC,&c. deſcribe Circulos quot­
cunque, & ſtatue tempus revolutionum inter perimetros duorum
quorumvis ex his Circulis, in Medio de quo egimus, eſſe ad tempus
revolutionum inter eoſdem in Medio propoſito, ut Medii propo­
ſiti denſitas mediocris inter hos Circulos ad Medii, de quo egimus,
denſitatem mediocrem inter eoſdem quam proxime: Sed & in ea­
dem quoque ratione eſſe Secantem anguli quo Spiralis præfinita,
in Medio de quo egimus, ſecat radium AS,ad Secantem anguli

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