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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0437
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/163127KK/pageimg/0437
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bus linearum, meridianę, & verticalis, vt acu mediante volui poſſit, prout oportebit.</
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<
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xml:space
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">Perfectum igitur cum fuerit op us hoc, te oportet ſcire modum ipſo vtendi. </
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<
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xml:space
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propter quotieſcunque volueris, aſpice Solis locum in Zodiaco, Ephemeridibus me
<
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diantibus, idem dico de vnoquoque reliquorum planetarum. </
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<
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xml:space
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">Inuento poſtea So-
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lis loco in noſtro Zodiaco horologij, manu mediante, volue oſtenſorem, ita, vt li-
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nea fiduciæ tranſeat per gradum Solis, deinde, claui ipſius horologij mediante, vol-
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ue indicem, ita cum Zodiaco coniunctum, vt linea fiducię, punctum, ſeu partem ho-
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rę oſtendat in limbo horologii, quę quidem hora notanda eſt ſi fuerit ex ijs quę in-
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cipiunt à meridie vſque ad mediam noctem, vel à media nocte vſque ad meri-
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diem, </
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<
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xml:id
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xml:space
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">tunc acu ſupradicta mediante, poſita in aliquo illorum quatuor foraminum,
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circunuoluenda eſt Tabula, ita, vt extremitas lineę meridianę ſupra orizontem, ex
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ęquo incidat inter duodecimam horam, & lineam fiducię, computum incipiendo à
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duodecima hora, ſi vero dicta indicis hora fuerit ex ijs quę
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à media nocte &
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deſinunt poſtea in meridie, oportebit, acu mediante, circunuoluere Tabulam, quo-
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uſque punctum extremum meridianæ ſub terra, medio loco exiſtat inter
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type
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horam, & horam oſtenſam à linea fiducię. </
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<
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xml:space
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">Quo facto continuo videbis erectam
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li</
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figuram. </
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<
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xml:id
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xml:space
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">& quia vidiſti loca planetarum in Ephemeridibus, videbis etiam
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eorum loca accidentalia in domibus ſcilicetaccidentalibus, ſi aliquas fixarum in
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Aranea deſiderabis, accipere poteris Ocu. ♉, cor. ♌, ſpi. ♍, Liram, Aquilam, &
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Arcturum, dum locus fuerit capax. </
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xml:space
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">Nec te moueat, quod oportebit lineam fiducię
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ſupra gra. Solis quotidie collocare, quod nihil refert. </
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<
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xml:space
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">Nam oportet etiam quoti-
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die cordam fuſo circunuoluere.</
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<
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">DE DEMONSTRATIONIBVS PROPOSITIONVM
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Mathematicarum, nec non de Aſtrologia Iudiciaria.</
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style
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llustriſſ
<
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>.D.</
var
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Volfardo Aiſeſtain.</
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<
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mihi gratius & iucundius afferri potuit tuis literis, quibus te cupi-
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dum oſtendis ſciendi rationem, quare ego non vna methodo ad omnes
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propoſitiones demonſtrandas vſus ſim, hoc eſt, </
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<
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xml:space
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">quare non omnia ea Eucl.
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Theoremata citem in vnaquaque propoſitione, quę ad
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demonſtrandam
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type
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,
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quemadmodum in mea Gnomonica vidiſti me aliquando omiſiſſe. </
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<
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xml:space
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">Reſpondeo
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mathematicę demonſtrationes, hominibus Euclidis Elementa poſſidentibus, non in
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digent aliqua citatione numerorum Theorematum ipſius Euclidis, & ſi aliquando
<
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vſus ſum aliqua citatione eorundem, hoc feci propter conſuetudinem noſtri tempo
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ris, vel etiam ad faciliorem intelligentiam illorum, quibus ſcribebam. </
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<
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quamuis minima citare, vt
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nonnulli, mihi, nimis laborioſum,
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>
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videtur, preſertim ijs (vt dixi) qui memoria tenent prima Elementa. </
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<
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eſt vna ratio. </
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<
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xml:space
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">Alia, quia multoties, ita coniuncta eſt ſpeculatio cum ipſa concluſio
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ne, vt mihi ſępius viſum ſit ſuperfluum, aliquid de ipſa theoria ſcribere. </
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<
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">In iis
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enim, quę dum puer eramſcripſi, videbis ſcrupuloſam illam methodum, ſed po-
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ſtea, non niſi in arduis propoſitionibus me nihil eſſentiale prętermittere.</
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</
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<
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<
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">Circa vero id de quo me interrogas, ſcilicet, vtrum putem omnia vera eſſe, ea
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quę ſcripta reperiuntur in libris Aſtrologæ iudiciarię. </
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<
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