Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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ad Occaſum inferiores ſphæræ tanta velocitate ferri dicuntur, vt ſtella
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fixa ſub Æquatore, vnico temporis minuto leucarum miriadas conficiat,
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quod certè non fidem modo, verùm etiam cogitationem ipſam ſuperat.
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<
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">Hunc porrò motum ablegamus, & ſimplici ac diurna telluris globi circa
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ſuum centrum turbinatione, ſeu revolutione præfatum motum ſup
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plemus. </
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Antim.
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<
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"> Ab hoc vltimo incipio; quia nonnulli multam vim in eo fa
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ciunt; cum tamen me parum, aut nihil proſus afficiat; nempe diverſas
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motuum velocitates per comparationem quamdam optimè intelligimus;
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Sit enim quodlibet terræ punctum in æquatore, ſuppoſita veſtra hypo
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theſi, illud, vt probè noſti, in turbinatione præfati globi, præſcindendo
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a motu centri, ita movetur, aſſumpto ſcilicet, quodam medio motu, vt vo
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cant, vt ſingulis horis 900. circiter miliaria Italica conficiat, 15.verò ſin
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gulis minutis primis, vno denique ſecundo minuto, 250. paſſus geome
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tricos, hoc eſt 1250. pedes; vt autem comparationem inſtituam, conſide
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ro motum glandis plumbeæ ex maiore catapulta exploſæ, quæ vno ſecun
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do minuto 1000. pedes circiter conficit; vnde vides punctum illud paulò
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dumtaxat velociùs moveri. </
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Auguſtin.
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"> Suſtine tantiſper; neſcio quid intelligas per illum medium
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motum. </
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Antim.
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<
s
id
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"> Intelligo motum æquabilem, ita vt ſingulis horis punctum
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illud æquale ſpatium decurrere cenſeatur, cùm tamen ſecus ac
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cidat. </
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Auguſtin.
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"> Non capio, exiſtimo enim rem ita eſſè, & æqualibus tempo
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ribus, æqualia ſpatia decurri. </
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Antim.
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<
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"> Ita ſanè nobis apparet, id tamen haud dubiè per errorem;
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nempe punctum illud motu quodam mixto movetur, ex motibus orbis
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& centri, ſic enim vocare ſoles; Vnde fit, vt pro diverſo ad ſolem aſpectu,
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modò tardiùs, modò velociùs moveatur; quia motus orbis ab hora ſexta
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veſpertina ad ſextam oppoſitam matutinam additur motui centri, ab hac
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verò ad illam detrahitur; ac proinde punctum illud in meridie collocatum
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tardiſſimè in aſpectu oppoſito, ſcilicet, mediænoctis, velociſſimè movetur
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quod vt ad rudiores calculos reducam, ſuppono, exempligratia, diametrum
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magni orbis, quem Sol ſecundùm meam, & terra ſecundùm veſtram hypo
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theſim decurrit, continere diametros terræ 2000. hoc poſito, motu centri,
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vno ſecundo minuto, decurruntur pedes circiter 6942. & motu orbis pe
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des 1250. adde vnum alteri, venient pedes 8192.hoc eſt ſpatium, quod di
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ctum punctum decurritin media nocte, tempore vnius ſecundi minuti
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detrahe verò, erunt pedes 5692. hoc eſt, ſpatium, quod eodem tempore,
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decurrit in meridie; Vides inæqualitatem. </
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">Semoto igitur illo inæquali
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motu, ex motibus orbis & centri reſultante, æqualem tantummodò conſi
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dero motum orbis, quo punctum terreſtris globi in Æquatore, ſingulis mi
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nutis ſecundis, pedes circiter 1250.decurrit. </
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Auguſtin.
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<
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"> Quid tum? </
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">Non video, quid tibi velis, ad infirmandum
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illud argumentum, quod ab incredibili velocitate motus raptus, ſeu </
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