Fabri, Honoré - Dialogi physici in quibus de motu terrae disputatur

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1ſpiralis, ſive etiam ellipſis, cogita punctum C accedere ad R motu acce
lerato per radium AC eo tempore quo radius AC circa centrum A in
eodem plano ductus pervenit in AG, ferens ſecum punctum illud mobi
le, quod tunc erit in G ; deinde idem punctum moveatur motu retardato

30[Figure 30]
ab R in D, dum prædictus codem motu pervenit in AE, tunc certè præ
dictum punctum erit in E ſcilicet in Perigæo ; quare hæc linea erit vna ex
ſpiralibus Archimedis, quæ ad ſemicirculum proxime accedit; quia vero
differentia ſenſibilis nen eſt, ſemicirculus ſupponi poteſt, in quo cen
trum terræ motu æquabili movetur; pari modo punctum illud redit à D
in R, & ab R ad A, dum idem radius ab AE redit in AC.

Auguſtin. Hæc mihi ſummoperè placent, cùm ex ſimpliciſſimis princi
piis deducantur; vna tamen difficultas ſeſe oculis meis objicit ; nam
æquali tempore, vt dicis, radius AC circumducitur in AG, vel AN, &
ab AN ad AF, igitur inæqualiter movetur, cùm arcus CN minor ſit
arcu NF.

Antim. Equidem extremitas radij AC movetur inæqualiter in cir
culo CHFP; punctum tamen C, ſeu centrum terræ ita movetur per
CGE motu mixto ex circulari, & recto, vt hic prorſus æquabilis reſul
tet: Hinc circulus CGEI eſt quidem excentricus, non tamen verus, in
quo ſcilicet terra motu ſimplici moveatur, ſed apparens; & conſequen
ter centrum B, tantùm apparens; item excentricitas AB; quæ omnia ex
prædicto motu mixto conſequi, neceſſe eſt; itemque anomaliam, id eſt,

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