Fabri, Honoré, Dialogi physici in quibus de motu terrae disputatur, 1665

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1 76[Figure 76]
PRÆSTANTISSIMO VIRO
CLAVDIO BASSET
HONORATVS FABRI. S.P.D.
EX quo Dialogos meos ad te miſi, vir ornatiſſime, nonnul­
la inter obſervandum mihi occurrerunt, de quibus te certio­
rem faciendum eſſe duxi: movit me ad obſervandum, ſche­
ma quoddam Saturnij ſytematis, æſtate præterita, in vrbe
à nonnullis in lucem editum, in quo cum annuli Saturnij
planum ab eo paralleliſmo, quem huc vſque obtinere vi­
ſum eſt, cum Æquatoris plano, totis ferè 10. vel 11. gradibus deflexiſſe vi­
deretur, cœlum conſulendum eſſe putavi, vt vel novum Phenomenon ne­
gligerem, ſi ſecus probaret obſervatio, vel meo calculo donarem, ſi tale,
prorſus exhiberetur: ad explorandum igitur me accinxi Teleſcopio 25.Pal­
morum adhibito, divinianis lentibus accuratiſſimè, pro more, elaboratis in­
ſtructo: Saturnius annulus ſtatim meis oculis ita ſe ſubjecit, vt ſumma ejuſ­
dem annuli portio ſupra ſummum globi verticem, media ferè latitudinis
annuli parte aſſurgeret, infra verò imam globi portionem, ima prædicti an­
nuli deſcenderet, eo ferè modo, quo in excuſo ſchemate repræſentabatur:
ſed vix elapſo modico temporis ſpatio, ſummam portionem annuli infra
ſummam portionem globi, infimam item globi infra imam annuli deprimi,
clariſſimè aſpexi; vtriuſque Phenomeni facies alternis vicibus ſeſe mihi
exhibuit, non tantùm ſemel iterúmque, ſed toties, quoties vitrum, Satur­
num versùs converti.
Obſervavi etiam, nigras illas auriculas, ſeu lacunas
globum inter & annulum contentas, modò contrahi, modò explicari, con­
trahi quidem, depreſſa ſuprema portione annuli infra ſummam globi, illa
verò aſſurgente, dilatari & explicari.
Obſervavi præterea, projectam à glo­
bo Saturni vmbram, ſecundùm ſolatum radium, in ſupremam portionem
annuli, dextrorſum ſcilicet, Ortum versùs, propter ſitum Solis Occidenta­
lem, ita vt per planum annuli, niger tractus ire videretur, qui, vt modò ap­
paret, ita mox expungitur, alternis vicibus, vt ſupra jam dixi.
Cuncta hæc
cum Divino noſtro, aliiſque obſervandi peritis hominibus ſæpè ac ſæpius
obſervavi.
Nec difficilè fuit, hujus Phœnomeni cauſam indagare; ſi enim ſuppona­
mus, huc illuc nutare ac librari planum annuli, circa majorem Diametrum
apparentis ellipſeos, ſcilicet Auſtrum versùs & Boream, illa omnia haud du-

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