Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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ſpiralis, ſive etiam ellipſis, cogita punctum C accedere ad R motu acce
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lerato per radium AC eo tempore quo radius AC circa centrum A in
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eodem plano ductus pervenit in AG, ferens ſecum punctum illud mobi
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le, quod tunc erit in G ; deinde idem punctum moveatur motu retardato
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ab R in D, dum prædictus codem motu pervenit in AE, tunc certè præ
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dictum punctum erit in E ſcilicet in Perigæo ; quare hæc linea erit vna ex
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ſpiralibus Archimedis, quæ ad ſemicirculum proxime accedit; quia vero
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differentia ſenſibilis nen eſt, ſemicirculus ſupponi poteſt, in quo cen
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trum terræ motu æquabili movetur; pari modo punctum illud redit à D
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in R, & ab R ad A, dum idem radius ab AE redit in AC. </
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Auguſtin.
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Hæc mihi ſummoperè placent, cùm ex ſimpliciſſimis princi
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piis deducantur; vna tamen difficultas ſeſe oculis meis objicit ; nam
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æquali tempore, vt dicis, radius AC circumducitur in AG, vel AN, &
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ab AN ad AF, igitur inæqualiter movetur, cùm arcus CN minor ſit
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arcu NF. </
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Antim.
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<
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culo CHFP; punctum tamen C, ſeu centrum terræ ita movetur per
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CGE motu mixto ex circulari, & recto, vt hic prorſus æquabilis reſul
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tet: Hinc circulus CGEI eſt quidem excentricus, non tamen verus, in
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quo ſcilicet terra motu ſimplici moveatur, ſed apparens; & conſequen
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ter centrum B, tantùm apparens; item excentricitas AB; quæ omnia ex
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prædicto motu mixto conſequi, neceſſe eſt; itemque anomaliam, id eſt, </
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