Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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[Figure 71]
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Antim.
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<
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"> Non ſomnio, Auguſtine; nihil dixi, quod demonſtrare non
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poſſim. </
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<
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">Sit enim
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centrũ
">centrum</
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vniverſi A, in quo
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Solem ſtatuitis; ſit arcus magni orbis
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DB, 29. circiter grad. quem ſcilicet
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terra decurrit, toto illo tempore; quo
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Luna ab vna copula, ad aliam ve
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nit; Sit AD. 2000.Semidiam. terræ
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DH 60. DB 508.circiter; vnde HD
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in DB octies fere continetur. </
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<
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id
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s.000831
">Sit au
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tem primùm Luna in copula H, vt
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deinde tranſeat per oppoſitionem G
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ad ſequentem copulam I eo tempore,
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quo terra decurrit arcum DCB: divi
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datur arcus DC in 4.partes æquales
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DELMC: ita progreditur terra cum
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Luna, vt terra ſitin D, Luna in H ;
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terra in E, Luna in O; terra in L,
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Luna in E; terra in M, Luna in P ;
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terra in C, Luna in G ; codem pro
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greſſionis ordine terra à C tendit in B, & Luna à G tendit in I. </
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<
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id
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">En tibi
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veram ac germanam lineam Lunaris motus in tua hypotheſi ; eodem por
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rò tempore Luna ſegmenta HE & EG conficit; vnde vides, quàm ſit inæ
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qualis motus; & multò majorem inæqualitatis proportionem invenies, ſi
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compares ſegmentum HO cum ſegmento EP, vel PG; & vt ſegmentum
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HO decurrit Luna, eo tempore, quo primum octantem ſuæ periodi, ap
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parenti motu decurrere videtur, id eſt 45. grad. ſi accipiamus minorem
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arcum v. g. 12. grad. paulò plùs, qui eſt arcus illius ferè diurnus, etſi com
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paremus ſpatium, quod acquirit intereà, reali motu, tum circa Novilu
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nium H, tum circa Plenilunium G, longè maior erit inæqualitatis propor
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tio inter illa duo ſpatia, æqualibus temporibus decurſa, licèt quoad appa
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rentiam æqualia ſpatia videantur. </
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<
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id
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">Vnde neceſſariò ſequitur, Lunam inæ
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quali motu moveri, reali ſcilicet & phyſico, atque in tanta inæqualitatis pro
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portione, vt qualibet aſſignabili major ſit. </
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Auguſtin.
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<
s
id
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"> Si nihil aliud habes, hæc minimè nos vrgent; nam ſuppo
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nimus Lunam moveri in epicyclo, cujus terra centrum eſt, ac proinde
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Luna movetur motu mixto ex motu orbis & motu centri, vtroque certè
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æquabili; ſed ex duobus motibus æquabilibus, motum mixtum minimè
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æquabilem reſultare mirum dictu non eſt; immo neſcire non potes, cuili
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bet hypotheſi, quæ epicyclos adſtruit, hoc eſſe commune. </
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Antim.
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<
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id
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"> Non dubitabam, quin hæc dicturus eſſes, ſed antequàm vlteriùs
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progrediar, non admittis, opinor, in Luna realem epicyclum; ſi enim realis
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Epicyclus eſſet, haud dubiè cum ſuperficie terræ intra 24.horas ſuum orbem
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abſolveret, quod certè abſurdum dictu eſt; cùm decurrat tantùm eo tempo
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re 12.gradus paulò plus. </
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