Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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lum diurnum majorem deſcribat, eam Iupiter haud dubiè antecedit, &
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poſt ſe relinquit, versùs ortum; & perinde illa ſe habet, quò ad apparen
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tem motum, atque ſi versùs ortum ſeu versùs T à Iove diſcedens move
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retur: Itaque, ſi ſupponamus, vna cum Iove, moveri rectas EA, FG, cir
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ca idem Mundi centrum, quartam Mediceam ab A versùs T, appatenti &
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æquabili motu, ire neceſſe eſt. </
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<
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">Cum verò ab Apogæo A, ad mediocrem diſtantiam D motu accelera
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to feratur, ſit datum tempus, quo ab A perveniret in T, ſi hoc dumtaxat
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motu accelerato, item quo perveniret in T, ſi primo illo dumtaxat æqua
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bili moveretur, haud dubiè ſi vtroque ſimul, mixto ſcilicet ex æqua
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bili per AT, & accelerato per AD, dato illo tempore, perveniet in F, per
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ſemiparabolam ACF, cujus axis eſt AD, & baſis DF. </
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">Si autem datum illud tempus in duo tempora æqualia dividatur; cer
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tè primo tempore, totius prioris dimidio, motu accelerato, acquiret AB,
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quæ eſt
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. </
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<
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">AD, iuxta doctrinam motuum; & ducta applicata BC, cum
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perpendiculari NC, motu illo æquabili æquiret AN, dimidiam AT,
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vel DF ; quia vt AD ad AB, ita Quadratum DF ad Quadratum BC ;
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igirur motu mixto ex vtroque, acquiret AC; ſecundo verò tempore, pri
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mo motu acquiret, BD altero NT, mixto ex vtroque CF, demiſſa por
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rò perpendiculati NCS, licet Medicea ſit reverà in C, tranſacto primo
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tempore, videtur tamen in S ; quia hæc in eodem proximè cum Iove pla
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no movetur; igitur ita re videtur apparenti motu per rectam DF, ſcilicet
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proximè, vt temporibus æqualibus, æqualia ferè ſpatia decurrat, quod certè
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noſtris obſervationibus toties repetitis mirificè conſentit. </
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">Vbi autem Medicea pervenit in F,
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cum Iove orbem decurrit; igi
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tur æquè citò, nec ab eo vltra regreditur; quia tamen ab hac mediocri
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diſtantia, tendit ad Perigæum E, motu retardato, circulum diurnum, diurno
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Iovis minorem deſcribere incipit; citiùs igitur illum abſolvit; vnde ver
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sùs occaſum, ad Iovem accedat, neceſſe eſt; & cum juxta doctrinam mo
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tuum, quo tempore, motu naturaliter accelerato, datum ſpatium decurri
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tur, æquale huic, retardato percurratur; certè, quo tempore ab A pervenit
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in F, motu mixto ex accelerato & æquabili, ab F pervenit in E motu mix
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to ex retardato & æquabili; & quo tempore à C pervenit in F, & ab A in
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C; ab F pervenit in Z, & à Z in E, quod eſt Perigæum; eodem modo ab E
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pervenit in G, mixto ex accelerato & æquabili, & à G in A mixto ex re
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tardato & æquabili. </
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<
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FG. </
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<
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">Sed vt aliquid de calculatione Iovialium dicam: ſuppono; integram
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revolutionem quartæ Mediceæ abſolvi diebus 16. hor.19.min.12. ſeu mi
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nutis 24192. accipio quartam partem, ſcilicet 6043. quibus ab A venit in
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F. ſuppono igitur DF diviſam in partes æquales 6048. item DG; ſuppo
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no demum certam Epocham, id eſt certum temporis punctum, quo Medi
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ceam eſſe in Apogæo A, conſtet; & ab eo tot dies fluxiſſe, puta 7. id eſt
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min. 10080. divido hunc numerum per 6043. & venit quotiens I cum re
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ſiduo 4032. Vnde colligo, Mediceam decurriſſe ſemel DF, & ab F versùs
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D, confeciſſe 4032. partes, quibus ſubtractis ex 6048. ſuperſunt 2016.hæc </
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