Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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16
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accommodant v.g. ad explicandas huiuſmodi paſſiones planetarum, puta
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Martis, nonnulli cum Ptolemæo Epicyclum poſuerunt, alij cum Tycone
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circulum cuius centrum in Sole ſemper fixum eſſet; alij cum Copernico
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orbem excentricum circa Solem immobilem in centro mundi; his autem
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ſtatutis, ac definitis circulorum diametris; periodis, ſitu, &c. </
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<
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">omnes ob
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ſervationes ad prædicta ſyſtemata, vt dixi, accommodant, licèt vt pluri
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mum, aliquæ parum congruant. </
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<
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id
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s.000208
">Hinc non mirum, ſi fortè ſupponant, Mar
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tem pluribus gradibus retrogredi, quam re ipſa retrogrediatur. </
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<
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">Sed iam ad
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alia tua poſtulata gradum facio. </
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Auguſtin.
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<
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"> Suſtine parumper, vnum exciderat, quod jam in mentem
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venit; dixiſti enim paulò ante, ni fallor, Solem in Perigæo ſuum orbem
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citiùs, in Apogæo tardiùs conficere; dies igitur noſtri ſunt inæquales. </
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Antim.
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"> Novum profectò dictu non eſt; nempe in antiqua etiam hypo
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theſi Ptolemaica, ex duplici capite illa dierum inæqualitas petitur; primò
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ex eo quod Sol in Apogæo excentrici in conſequentia versùs ortum videa
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tur tardiùs promoveri, contra verò velociùs in Perigæo ; igitur in Apogæo
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citiùs orbem ſuum abſolvit, diurnum ſcilicet, ab ortu ad occaſum, tardiùs
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verò in Perigæo: Igitur circa Solſtitium æſtivum, ex hoc capite ſunt bre
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viores, & circa brumale, longiores. </
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">Secundò ex aſcenſione recta & obli
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qua Eclipticæ, nempe æquali tempore major arcus aſcendit obliquæ, quàm
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rectæ; Igitur Sol in Solſtitiis in quibus eſt aſcenſio recta, tardiùs, in Æqui
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noctiis, in quibus eſt obliqua velociùs orbem diurnum abſolvit. </
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<
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">Sed his
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rejectis, ex alio capite, prædictam inæqualitatem etiam duci poſſe dicimus;
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ſcilicet ex inæqualibus circulis, ſeu ſpiris à Sole decurſis, cum eodem ſci
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licet velocitatis gradu; vnde reverà fit, vt Apogæus majorem, & tardiùs,
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Perigæus verò breviorem & citiùs orbem decurrat; Vellem, vt fideli fune
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pendulo inæqualitatem illam probares, numerato ſcilicet vibrationum nu
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mero, idque ſub initium Iulij & Ianuarij: Tunc enim eſt aliqua, etiam for
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tè ſenſibilis circulorum in æqualitas, igitur & dierum; & plures vibratio
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nes numerantur intra ſpatium ſemihoræ ſub initium Iulij, Sole in Apogæo
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exiſtente, quàm ſub initium Ianuarij, quo tempore Sol in Perigæo ver
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ſatur; & his vibrationibus, crede mihi, aliquam differentiam invenires,
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minimam certè, at, niſi ſallor, ſenſibilem. </
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Auguſtin.
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<
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"> Si hæc cum veritate conſentiant, nullus dubitat, quin Aſtro
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nomos plurimùm tibi obſtrinxeris, ſed antequam meis poſtulatis facias
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ſatis, ſi tibi grave non eſſet, vellem, vt rude ſaltem tui ſyſtematis Solaris
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ſchema mihi exhiberes. </
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Antim.
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<
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id
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"> Prolixior reverà eſſem, ſi rem hanc, vt par eſt, explicandam
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ſuſciperem; ſed quandoquidem rudiorem dumtaxat delineationem fla
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gitas, eò libentiùs tibi morem geram. </
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