Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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aëris, cujus pars versùs A, & pars versùs I gravitet, tribus modis definiri
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poteſt hujus cylindri portio, quæ versùs A, & ea; quæ versùs I gravitat;
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Primo diviſa AI bifariam in F ; & ſic FK gravitat versùs I & FB versùs A.
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">Secundo diviſa bifariam BK in M, & ſic BM versùs A, & MK
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versùs I. gravitat. </
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<
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">Tertiò ita diviſa AI vt ſegmentum gravitans ver
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sùs A, ſit ad aliud gravitans versùs I, vt globus A ad globum I.
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</
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">Quartus modus addi poteſt, vt ſcilicet BK ſecetur juxta dictam propor
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tio nem globorum. </
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<
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id
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">Quidquid autem ex his dicatur, ad rem noſtram perinde
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eſt; quare majoris facilitatis gratia, primum modum accipio, & per punctum
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F duco GFH perpendiculariter, quæ vocetur dirimens connectentem
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centra, ſeu linea confinium. </
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">Quod dixi de AF, IF, de AN, IN dictum eſto,
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item de reliquis lineis, ſeu cylindris. </
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Chryſocom.
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"> Multis ſanè, præſertim Peripateticis, hæc tua doctrina mi
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nimè probabitur, qui juxta mentem Philoſophi docent, centrum terræ
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idem eſſe cum centro Vniverſi, versùs quod omnia gravia tendunt; nega
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bunt igitur portionem aëris ſupra dirimentem GH, versùs Lunæ cen
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trum gravitare. </
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Antim.
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id
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"> Videtur quidem Stagirita hoc ipſum, quod dicis ad ſtruere; præ
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ſertim lib.2. de cœlo text. </
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<
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">100.
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Accidit autem,
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inquit,
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idem terræ medium
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eſſe, ac Vniverſi,
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ſed vt terræ centrum eſt, in id ferri per accidens; per ſe
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verò ad centrum Vniverſi; de hoc tamen lib. 3. text.33. dubitare videtur;
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vbi enim dixiſſet, quidquid pondus habet, ferri ad medium, ſeu versùs
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centrum, ſtatim ſubdit hæc:
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vtrùm autem ad terræ medium, an Vniverſi
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feratur, cùm idem medium ſit ipſorum, alia ratio eſt.
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Cùm autem Ariſtoteles
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cœlos ſolidos poſuerit, & Sphæram ignis aëre ſuperiorem, & quintam
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eſſentiam, quam animatam eſſe indicare videtur, quid mirum, cùm ele
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menta noſtra, juxta illum, vltra concavum Lunæ non extendantur, & ſuis
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orbibus ſolidis ſolidi Planetæ affixi ſint, nihil vltra prorsùs gravitare aut
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levitare, ac proinde gravium & levium commune centrum in Mundi &
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Terræ centro collocavit. </
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<
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id
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">Si tamen cœlum eſſe fluidum putaſſet, & cœ
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leſtes Sphæras in illo communi medio moveri, & ſuos agere orbes; ſi
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Cometas de novo gigni & mori in ætherea regione, nec non faculas &
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maculas in Solis diſco. </
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<
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">Martem propiùs ad terras nonnunquam accedere
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quàm Solem; novas Stellas in Cœlo naſci; ſi demùm alia multa, quæ
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jam ex obſervationibus comperta ſunt, ſciviſſet, non eſt dubium, quin alia
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de Cœlo & Vniverſi conſtructione ſcripſiſſet; quanquam cum Ariſtotele
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Dico centrum terræ Vniverſi centrum eſſe, circa quod cœleſtes Sphæræ
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ſuos orbes agunt, versùs quod illa omnia gravia tendunt, ſublunaria ſci
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licet, quæ Ariſtoteles agnovit; ſed cùm hoc commune medium vltra
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extendatur, & eadem ratione pro formatione & conſervatione militet
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in aliis globis; tot pono centra, in quæ partes circumpoſitæ nituntur,
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quot ſunt globi totales; gravitas enim non totius, ſed partium proprietas
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eſt, cujus vi quælibet pars versùs ſuum centrum nititur, & contranititur,
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ne ab eo ſeparet ut, & ſi vnquam ab eo ſeparetur, in illud denuò ſe reci
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pit. Quid vero ad conmune medium ſpectat, illius pottio verſùs illam</
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