Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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">Septimò, Præterea dum ex puncto A primum emergeret, ac deinde ar
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cum HS, decurreret, qui continet Diametrum 1 1/5. ac denuo immergere
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tur in puncto S, ac proinde tunc diſtaret à centro Iovis, Diametr. 1 1/5. dato
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quod AK eſſet 11. Diametror. </
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<
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">at ſecus accidit obſervanti; illud enim ſe
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cundæ immerſionis punctum à centro Iovis minùs diſtabat. </
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<
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">Obſervatio ce
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lebris fuit Die 23. Septembr. hujus Anni 1664. Hor.poſt Merid.6. min.46.
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circiter: vbi enim aſpexi quartam Mediceam ex vmbra primùm emergen
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tem, illa haud dubiè à Iovis centro vix diſtabat Diametr. 1 1/2. tum au
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tem aderant, præter Euſtachium noſtrum, duo viri præſtantiſſimi, & rerum
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iſtarum peritiſſimi, ſcilicet D. </
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<
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">Ciampinus & D. Lucius. </
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">Octavò, Hinc autem axem parabolæ, quam Epicycli loco ſubſtitui poſ
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ſe, jam ſupra ſignificavi, habere poſſum; aſſumpta enim AC Diametr. 1 1/2.
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& ducta CT parallela AG, ſit vt AE ad AC, ita hæc ad tertiam, ſitque
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vt differentia hujus tertiæ & AE, ad CT, ita AE ad AX, hæc eſt axis
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Parabolæ; eſt autem AC ad CT, vt BD ad DL. pro aliis Mediceis, ea
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dem ratio facit. </
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">Nonò, Scio, eſſe nonnullos, qui excentricos adhibent, quorum centrum
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ſit versùs ortum, vel occaſum; ſed profectò maxima digreſſio æqualis vtrim
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que ſemper à me obſervata eſt, ejuſdem ſcilicet Mediceæ. </
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<
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">Decimò, Quod ſpectat ad latitudinem Medicearum, certò conſtat, ex
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obſervationibus, eas non videri ſemper in eadem linea, per centrum Iovis
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ducta, id eſt, in eodem plano Iovialis orbitæ; vnde aliqui epicyclos adhi
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bent, à prædictæ orbitæ plano declinantes; ſed, ni fallor, perperam; cum
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ſæpè accidat, eandem Mediceam in eadem à centro Iovis diſtantia, ſive ad
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ortum, ſive ad occaſum, modò versùs Boream, modò versùs Auſtrum decli
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nare, modò in linea, per centrum Iovis ducta, abſque vlla declinatione, ſi
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tam eſſe: hoc autem ex eo procedit, quod Medicea niſum exerat, adhoc vt
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ſemper in eo plano verſetur, ac proinde ratione motus accelerati & retar
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dati, lineam ſuperet, & modò huc, modò illuc declinet: ſed hujus declina
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tionis limes nondum perſpectus eſt, nec periodus comperta; quare accu
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ratiori opus eſt indagine. </
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<
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">Vndecimò, Medicea non movetur in Epicyclo, reali motu, quod facilè
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demonſtratur; ſit enim quarta Medicea in Apogæo G.movetur versùs or
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tum, & diurno motu acquirit in linea AE Diametros Iovis 2 1/2.id eſt min.2.
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ſec.4ò. </
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<
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">Iupiter verò ſingulis annis, ortum versùs acquirit 30.grad.circiter
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ſingulis menſibus grad. 2. 3ò, ſingulis diebus min. 5. igitur Medicea
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primo die recederet à Iovis centro min. 2. 2ò, versùs occaſum: de
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fertur, inquies, à Iove centrum Epicycli; ſed profectò deferri nequit, niſi
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ſolidum ſupponas: annulum fortè ſolidum accerſes, cui Medicea affixa ſit,
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vt in Saturno; fateor, hoc dici poſſe, modò dictus annulus nihil prorſus lu
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minis reflectat; obſtat tamen allata ſupra ſpatiorum æqualium motu diur
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no acquiſitorum ratio, niſi parabolam ponas. </
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<
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">Sed longè facilius dictu eſt,
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Iovem & Mediceam æquali motu moveri, eoque ſimpliciſſimo, occaſum
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versùs; ac proinde illam versùs occaſum ire apparenter, à puncto maximæ
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digreſſionis ortivæ, ad punctum maximæ occiduæ; & ab hac, ad illam, ver-</
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