Benedetti, Giovanni Battista de
,
Io. Baptistae Benedicti ... Diversarvm specvlationvm mathematicarum, et physicarum liber : quarum seriem sequens pagina indicabit ; [annotated and critiqued by Guidobaldo Del Monte]
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EPISTOL AE.
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339
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file
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0339
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xlink:href
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<
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<
s
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xml:space
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">Huiuſmodi rei ratio per ſe nota erit quotieſcunque cogitauerimus verum arcum
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>e.b.</
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amplitudinis æſtiuæ,
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quę parallela erit
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vnde cum Sol tem-
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pore æſtiuo orietur, tunc radios ſuos emittet via iſtarum æquidiſtantium linearum.</
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">Sed ſi longiores gnomones cuperes, oportebit eos tres eſſe, quorum vnus erit
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orientalis in puncto
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alter occi-
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dentalis in puncto
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reliquus ve-
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xlink:href
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rò meridionalis in puncto
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>.f.</
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quo-
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rum
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poteſt eſſe maior
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tertia parte ſemidiametri cyllin-
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dri, ſed ſi voluerimus ſcire
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ad plus poſſit eſſe longus vnuſ-
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quiſque illorum, ita faciendum
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erit.</
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<
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ex
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ſemidiametro dicti circuli, a dia-
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metro poſtea
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huiuſmodi qua
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drati ſubtrahatur ſemidiameter
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o.e.</
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circuli, reſiduum verò
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ip-
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ſius diametri
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quadrati, erit
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norm
="
lon
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type
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>
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gitudo gnomonis, vbi ſimul appa
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ret huiuſmodi rei ratio, eo quod
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cum gnomon
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>
orientalis deſi-
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net operari, illico meridionalis
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f.g.</
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>
ſubintrabit, poſt hunc verò occidentalis
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>
monſtrabit reliquum diei.</
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xml:space
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">AD EVNDEM.</
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number
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file
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0339-02
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xlink:href
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ctum idem facere volueris
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eſto conus
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>
& R. qui diuiſus ima
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ginatione ſit à quodam plano per
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axem, & communis ſectio ſit trian
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gulus
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>
& R. in quo plano cogite
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mus gnomonem infixum ad rectos
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vbi volueris, qui ſit
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>
cogitem
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etiam
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>
aliud eſſe planum (in
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quo ſit gnomon) quod conum ſe
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cet, quæ quidem ſectio, circularis
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erit, ex .4. primi Pergei. </
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mur etiam ſuperficiem
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>
eſſe azi
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mut in quo gnomonreperirur, ſu-
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<
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azimut propoſitæ
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horę,
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contrapoſi
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angulo altitudinis Solis ab ori- </
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