Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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Auguſtin.
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<
s
id
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s.000882
"> Probè intelligo tuum ſyſtema Lunare; vis enim Lunam ſim
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plici motu moveri ab Ortu ad Occaſum, ſed longè tardiùs, quàm ſtellas;
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ita vt intra tempus vnius menſis periodici Luna à Stellis retro relicta ver
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sùs Ortum, videatur totum Zodiacum percurrere, & ad idem punctum
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redire; & quia Sol toto eo tempore versùs Ortum relictus eſt, quaſi 27.
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grad. antequam ad copulam Luna redeat, duobus diebus & aliquot horis
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opus eſt: hunc menſis Synodicus longior periodico; addis vtriuſque incli
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nationis motum, ita vt ſecundæ terminus ſit Eclyptica; & quia motus ſe
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cundæ abſolvitur paulò ante finem periodici, hinc motus Nodorum ver
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sùs Occaſum, itemque Apogæi versùs Ortum; quia periodus intra quam
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Luna redit ad Apogæum, paulò longior eſt menſe periodico: inæqualitas
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ſimplex eodem modo à te explicatur in Luna, & in Sole; aliæ ex diverſa
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combinatione vtriuſque inclinationis naſcuntur: Latitudinem per motum
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ſecundæ inclinationis facilè omninò explicas, Vtrùm verò major ſit Lati
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tudo in Quadraturis, quàm in Copulis, incertum putas, itemque multa alia
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incerta, quæ ſupra obiter recenſuiſti; optimè demum explicas, quomodo
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menſes Periodici modò majores ſint, modò minores, itèmque Synodici,
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menſes enim Periodici majores ſunt, quando Nodi ſunt circa Æquato
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rem, minores verò, quando ſunt circa Tropicos; Synodici autem majores
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ſunt, dum Sol eſt circa Apogæum, dum verò circa Perigæum minores;
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neque in his vlla reſtat difficultas; vnum tantùm ex te reſcire velim, Anti
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me, quid cenſeas de libratione illa Lunari, qua ſit, vt quædam interdum
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maculæ ad margines diſci Lunaris propiùs accedant, aliàs, ab iis longiùs
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recedant. </
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Antim
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Hevelio fideliſſimo & accuratiſſimo Lunarium Phænomenon
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obſervatori, in his detrectari fidem, non auſim ; hic autem vult, Lunam
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ita librari, vt cùm maximè ab Æquatore declinat, versùs Boream, macu
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læ Boreales in ejus diſco recedant à margine, Auſtrales contra ad margi
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nes accedant; & viciſſim cùm maximè declinat versùs Auſtrum, auſtra
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les recedant, accedant verò Boreales. </
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<
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">Nonnulli ex veſtris, Auguſtine, ſta
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tuunt ad hunc finem, Lunarem axem ſibi ipſi parallelum, & Axi mundi; ſed
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meo judicio perperam ſatis, dum enim versùs Tropicum Cancri acce
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dit Luna, extremitas Borealis axis attolleretur, vt patet, igitur & Semicir
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culus diſci Borealis, & Auſtralis de primeretur; ex quo contraria Phænome
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na ſequerentur; Malim dicere Lunarem Globum magnetica forſan virtute
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pellere, ac proinde habere duos polos magneticos; igitur codem prorſus
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modo ſeſe componit ad terreſtrem Globum, quo terrella quæpiam, vel
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acus magnetica; igitur quando Luna versùs Boream tendit ab Æquatore,
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extremitas borealis axis deprimitur, Auſtralis verò attollitur, & viciſſim;
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cùm Luna ab Æquatore versùs Auſtrum excurrit; Auſtralis deprimitur,
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Borealis attollitur, ex quo prædicti effectus neceſſariò conſequuntur. </
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Chryſocom.
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<
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"> Parum admodùm abeſt, quin hoc apprimè capiam; nonni
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hil ſchematis deſiderarem, vt hoc meliùs inculcetur </
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Auguſtin.
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<
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"> Id mihi præſtandum ſuſcipio: ſit meridianus Lunaris SBTK,
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Axis magneticus BK, ſemicirculus ad terram converſus BSK, qui in </
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