Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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PRÆSTANTISSIMO VIRO
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CLAVDIO BASSET
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HONORATVS FABRI. S.P.D.
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<
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">EX quo Dialogos meos ad te miſi, vir ornatiſſime, nonnul
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la inter
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abbr
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obſervandũ
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mihi occurrerunt, de quibus te certio
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rem faciendum eſſe duxi: movit me ad obſervandum, ſche
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ma quoddam Saturnij ſytematis, æſtate præterita, in vrbe
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à nonnullis in lucem editum, in quo cum annuli Saturnij
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planum ab eo paralleliſmo, quem huc vſque obtinere vi
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ſum eſt, cum Æquatoris plano, totis ferè 10. vel 11. gradibus deflexiſſe vi
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deretur, cœlum conſulendum eſſe putavi, vt vel novum Phenomenon ne
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gligerem, ſi ſecus probaret obſervatio, vel meo calculo donarem, ſi tale,
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prorſus exhiberetur: ad explorandum igitur me accinxi Teleſcopio 25.Pal
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morum adhibito, divinianis lentibus accuratiſſimè, pro more, elaboratis in
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ſtructo: Saturnius annulus ſtatim meis oculis ita ſe ſubjecit, vt ſumma ejuſ
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dem annuli portio ſupra ſummum globi verticem, media ferè latitudinis
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annuli parte aſſurgeret, infra verò imam globi portionem, ima prædicti an
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nuli deſcenderet, eo ferè modo, quo in excuſo ſchemate repræſentabatur:
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ſed vix elapſo modico temporis ſpatio, ſummam portionem annuli infra
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ſummam portionem globi, infimam item globi infra imam annuli deprimi,
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clariſſimè aſpexi; vtriuſque Phenomeni facies alternis vicibus ſeſe mihi
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exhibuit, non tantùm ſemel iterúmque, ſed toties, quoties vitrum, Satur
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num versùs converti. </
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<
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id
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">Obſervavi etiam, nigras illas auriculas, ſeu lacunas
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globum inter & annulum contentas, modò contrahi, modò explicari, con
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trahi quidem, depreſſa ſuprema portione annuli infra ſummam globi, illa
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verò aſſurgente, dilatari & explicari. </
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<
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id
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s.002571
">Obſervavi præterea, projectam à glo
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bo Saturni vmbram, ſecundùm ſolatum radium, in ſupremam portionem
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annuli, dextrorſum ſcilicet, Ortum versùs, propter ſitum Solis Occidenta
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lem, ita vt per planum annuli, niger tractus ire videretur, qui, vt modò ap
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paret, ita mox expungitur, alternis vicibus, vt ſupra jam dixi. </
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<
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">Cuncta hæc
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cum Divino noſtro, aliiſque obſervandi peritis hominibus ſæpè ac ſæpius
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obſervavi. </
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<
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id
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">Nec difficilè fuit, hujus Phœnomeni cauſam indagare; ſi enim ſuppona
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mus, huc illuc nutare ac librari planum annuli, circa majorem Diametrum
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abbr
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apparẽtis
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ellipſeos, ſcilicet Auſtrum versùs & Boream, illa omnia haud du-</
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