Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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114
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Luna communicet corporibus ſublunaribus, in Plenilunio; longè minùs
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in Quadraturis; in Novilunio demum minùs quidem quam in Plenilunio,
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plus verò quam in Quadraturis. </
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Auguſtin.
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Hæc ſanè mihi ſummopere placent; volvo tamen in mente
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nonnihil difficilè. </
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<
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id
="
s.001316
">Fingamus enim Lunam in L, vaporemque eductum
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attolli ſecundùm altitudinem LE, quem vocemus radium Atmoſphæræ
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Lunaris; erit prædictæ Atmoſphæræ Hemiſphærium BED; & in toto
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illo orbe LMKR, æquale Hemiſphærium, vt HGI, QNO, TVX fin
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gendum eſt. </
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<
s
id
="
s.001317
">In Novilunio verò, Hemiſphærium Atmoſphæræ Lunaris
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erit QPO, & in orbe illo diurno, TSX, BCD, HFI, in Quadratura
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verò M, erit GIF, PQN, SXV, CDE, denique in Quadratura R, erit
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STV, CBE, GHF, PON. </
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">Vnde ſequitur meo judicio, æqualem
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ſemper eſſe humoris educti copiam circumfuſam, ac proinde æqualem
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gravitationem & preſſionem; igitur æqualem æſtum. </
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Antim.
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<
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id
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s.001320
"> Fateor vltro æqualem ferè ſemper eſſe portionem humoris Lu
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naris educti, admixtique aëris tractui intra Atmoſphæram orbitæ Lunaris
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contenti, ſed hic parum denſatur, ac proinde vix gravior evadit, niſi intra
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vmbras ab alterutro globo projectas immergatur; neque hoc ſufficit, niſi
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gravior factus propior terræ ſit, quàm Lunæ; hoc autem circa Plenilunium
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fieri conſtat, in quo ſcilicet vmbra terræ projicitur quaſi directè versùs Lu
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nam; vnde magna humoris educti copia in dictam vmbram immergitur,
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ac proinde denſatur, & gravior evadit; Lunâ autem recedente ab L, ver
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sùs M, & K, humor ille tandem propior terræ fit: quid mirum igitur, ſi
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aër, cui admixtus eſt magis in terram gravitet? </
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>
<
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id
="
s.001322
">Idem dico de Novilunio.
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</
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<
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id
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">Vbi enim Luna ex K Novilunij puncto pervenit per R in L, Sol ferè li
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neæ EC reſpondet, vnde vtraque vmbra tum Lunæ, tum terræ projicitur
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in illum aëris tractum, qui eſt circa P, & cui eductus humor admixtus eſt;
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hinc valdè denſatur & gravior fit, & cùm ſit propior terræ, verſus illam
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tendit, deſcenditque infra dirimentem: Si autem Luna ponatur in Quadra
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tura M, vmbræ Lunæ ille aëris tractus, qui eſt inter IO, & cui humor
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eductus admixtus eſt, ſtatim diuque immergitur, vt patet; ſive vmbra pro
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jecta ſit à Luna, Sole poſito inter QT, & Luna inter OI, ſive ab ipſa
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terra, Sole ſito paulò vltra R & Luna in K ; hinc denſatur & gravior fit, &
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cùm Luna tunc fit propior, in eam gravitat & tendit. </
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<
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id
="
s.001324
">Denique ſi Luna
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ponatur in Quadratura R, ille aëris tractus, cui humor eductus admixtus
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eſt, vmbræ terræ immergitur, quando Sol pervenit ferè in M ; Sed tunc Lu
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na eſt circa K, igitur vicinior, igitur in Lunam gravitat; pari modo, So
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le poſito inter IO, Luna verò inter QT, immergitur in vmbram Lu
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næ; ſed tunc etiam gravitat in Lunam, cui propior eſt. </
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Auguſtin.
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<
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id
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s.001326
"> Rem hanc probè intelligo, & nihil clarius eſſe videtur; duo
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tantùm ex te ſcire velim, immò tria; primum eſt, vtrùm Sol æquali
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ter agat in illud Hemiſphærium Lunæ, quod illuſtrat, v.g.in BED, quan
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do eſt Plenilunium; Secundum eſt, quid tandem fiat de humore illo ex
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Luna educto, terriſque illapſo. </
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>
<
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id
="
s.001327
">Tertium vtrùm ipſo Plenilunij die ſit ma
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ximus æſtus, an paulò ante, ſeu poſt Oppoſitionis momentum. </
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archimedes
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