Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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72
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ſpectat ad menſem periodicum, eam ſcilicet temporis periodum, qua
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Luna ab Occaſu ad Ortum totum Zodiacum decurrere videtur; modò
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longior, modò brevior eſt, pro diverſo Nodorum ſitu; ſi enim Nodi
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exiſtant, in punctis Eclipticæ Æquinoctialibus, haud dubiè Luna
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ſuas ſpiras agens longiùs versùs Polos excurrit, minùs verò longè
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Nodis in punctis Solſtitialibus exiſtentibus; ſed quò longiùs excur
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rit, plus temporis ponit; Major igitur eſt periodus; quid clarius
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ſupet hoc dici, vel excogitari poſſit, vereor ſanè vt quiſpiam vi
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deat. </
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Chryſocom.
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<
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id
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"> Mirum mihi accidit, Antime, cur adeò in motuum rea
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lium inæqualitatem inveharis, cùm tamen motum vtriuſque inclinatio
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nis inæqualem in tuo ſyſtemate ſtatuas; acceleratum ſcilicet & retar
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datum. </
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Antim.
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<
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id
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"> Hanc inſtantiam facilè ſolvere, vel; vt veriùs dicam, eludere
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poſſem, ſi dicerem, eſſe motus rectos, qui ex natura ſua accelerati ſunt,
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vel retardati; nempe vel ad ſuum naturalem terminum tendunt, vel ab eo
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recedunt; ſi primum, acceleratos; ſi alterum, retardatos eſſe, oportet;
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ſed hi re verà motus non ſunt, qui tantùm conſiderantur in decurſi ſpatij
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linea, in qua æqualibus temporibus æqualia ſemper ſpatia à Planeta de
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curruntur, licèt inæqualia nobis appareant: & verò æquabilem mo
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rum eſſe, neceſſe eſt, cuius æqualis eademque cauſa ſemper manet, idem
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ſcilicet impetus, vel initio impreſſus, vel eo, quo dixi modo, acqui
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ſitus. </
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Chryſocom.
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<
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"> Nunquid tantulùm ſaltem retardat medij reſiſtentia, vt in
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projectis, immò & deorſum cadentibus fieri videmus? </
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Antim.
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<
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id
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"> Certè non retardat, ſi medium ſimul & Planeta eodem
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motu moveantur; Sed hoc adſtruere non cogimur, cùm nulla ratio
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ne nitatur; medium enim commune eſt; Reſpondeo igitur, cladem
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illam à reſiſtentia medij acceptam à Planeta continuo reſarciri, vel,
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vt meliùs dicam, impediri; vt enim iuxta optimum Naturæ inſtitutum,
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impetum non auget, ne ſcilicet obtinendo fini adverſetur, ita nec eun
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dem impetum minui ſinit, quod non minùs eidem repugnaret in
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ſtituto. </
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Auguſtin.
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<
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id
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"> Sed ne totus ſis in præludiis, ad tuum illud argumentum con
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tra meam hypotheſim à Luna petitum veniendum eſſet. </
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Antim.
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<
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id
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"> His præmiſſis, ad illud venio, ac dico, in tua hypotheſi, realem
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Lunæ motum, eum ſcilicet, qui nobis æqualis ferè apparet, adeò inæqualem
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fore, vt aliquando infinities tardior aut velocior eſſet. </
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Auguſtin.
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<
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id
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"> Somnia narras, Antime, quis vnquam hoc dixit, vel cogita
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vit? </
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<
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id
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">Luna circa terram iret, quamvis mobilem, inæquali certè motu, quoad
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apparentiam, re ipſa tamen ferè æquali; cùm arcus vno die decurſus paucis
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minutis arcum alio die decurſum ſuperet; hæc eſt trita illa anomalia, eaque
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multiplex in Luna, quam noſtri per excentricos, vel epicyclos, vel circellos
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explicant; ſed hæc inæqualitas præterquàm quòd apparens, non verò rea
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lis eſt tanta, non ſtatuitur, ne dum infinita. </
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