Biancani, Giuseppe
,
Aristotelis loca mathematica
,
1615
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faciunt ij, qui has demonſtrationes
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vlla libri Datorum mentione ex
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plicare conantur, cum manifeſtè illo innitantur.</
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quirat, is legat 74. 75. 76. propoſitiones 10. Vitell. vel ſequentem noſtram
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de Iride additionem. </
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<
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impeditam Ariſt. tra
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ctationem in gratiam textus illius, vt inſtituti mei ratio poſtulabat, perſe
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quutus ſum.</
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181</
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<
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">Ibidem
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(Quod autem in minoribus quidem diebus ijs, qui poſt æquinoctium au
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tumnale
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cõtingit
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ſemper fieri Iridem: in longioribus aurem diebus ijs qui ab æqui
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noctio altero, ad æquinoctium alterum circa meridiem non fit Iris, cauſa est, quia
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quæ ad Vrſam ſectiones omnes maiores ſunt ſemicirculo, & ſemper ad maiores quod
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autem eſt occultum, paruum: quæ autem ad æquatoris meridiem ſectiones, quæ qui
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dem ſupra ſectio, parua; quæ autem ſub terra magna, & ſemper maiores, quæ lon
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gius. </
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id
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">quare in ijs, qui ad æſtiuas verſiones diebus propter magnitudinem ſectionis,
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antequam veniat G, ad medium ſectionis, infra iam pœnitus fit P; propterea quod
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longè diſtat à terra meridies propter magnitudinem ſectionis. </
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<
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id
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">In ijs autem diebus,
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qui ad hyemales verſiones, quia non multŭμ ſunt ſupra terram ſectiones circulorum,
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contrarium neceſſarium fieri, modicum enim eleuato in quo G, in meridie fit Sol)
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quærit cur poſt æquinoctium autumnale vſque ad vernum, hoc eſt hyemali
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tempore, Iris appareat etiam Sole meridiem occupante: reliquo autem
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tempore æſtiuo, quod eſt ab æquinoctio verno ad autumnale appareat tan
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tum Sole vel in ortu, aut occaſu exiſtente, vel parum ſupra terram ſublato.
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</
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<
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">cauſa autem huius refert in ſectiones parallelorum circulorum, quos Sol
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diurno motu inter
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deſcribit: nam ſectiones parallelorum,
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qui ſunt ad Vrſam, ideſt in parte ſphæræ Boreali, qui omnes ſunt inter æqua
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torem, & tropicum Cancri; ſectiones inquam horum circulorum, quæ ſunt
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ſupra horizontem, maiores ſunt ſectionibus infra horizontem depreſſis, &
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ſemper eò maiores, quò propiores ſunt Cancro, ita vt magna valdè ſit ea
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portio, quæ eſt ſupra terram, exigua verò admodum, quæ infra (intelligan
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tur hæc in ſphæra obliqua, cuius polus eleuetur grad. 45. circiter) quare
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quando aſtrum G, conſcenderit meridiem, adeò P, polus Iridis, & etiam
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centrum eius infra terram deprimitur, vt aut nihil, aut inſenſibile quid de
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Iridis ambitu ſupra terram eleuari poſſit, contrarium accidit in parallelis
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meridionalibus, quia eorum ſectiones ſuperiores ſunt ſemper inferioribus
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minores, quapropter etiam ſi aſtrum ad meridiem eleuetur, parum tamen
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attollitur, & conſequenter centrum
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Iridis parum infra horizontem
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deſcendit, ac propterea etiam in meridie pars ipſius ſatis ma
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gna conſpicitur. </
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<
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">quæ omnia adhibita ſphæra materia
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li, eaque aſtronomicè ad ſuam eleuationem
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accommodata, nullo negotio li
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cebit intueri.</
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