Clavius, Christoph
,
In Sphaeram Ioannis de Sacro Bosco commentarius
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Comment. in III. Cap. Sphæræ
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arcus prædictus Aequatoris continet grad. </
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<
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<
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<
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vocatur deſcenſio tertij gradus ♌, quia unà cum eo deſcẽdit, & </
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<
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">Itaq; </
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<
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">aſcenſio, ſiue deſcenſio cuiuſlibet puncti Eclipticæ, uel etiã ſtellæ cuiuſ-
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uis, eadẽ eſt, quæ aſcenſio, uel deſcenſio arcus Eclipticæ, qui ab initio ♈, cõpu
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tatur ſecundum ſignorũ ſucceſſionẽ uſq; </
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<
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">ad Horizonté, poſita ſtella, uel gra-
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du Eclipticæ in Horizonte præciſe, ex parte quidem orientis ſi de aſcenſione
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ſermo habeatur, ex parte vero occidentis, ſi deſcenſionis habeatur ratio.</
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<
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">SIGNVM autem recte oriri dicitur, cum quo maior pars Aequi-
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note-358-01
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note-358-01a
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cte, uel obli
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que oriri,
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aut occide-
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I
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e quid.</
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noctialis oritur: </
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dum eſt de occaſu.</
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<
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dictum eſt, Aequatorem ſecundum omnes ſui partes unifor
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miter ſupra Horizontem eleuari, non autẽ Zodiacum, fit, ut aliquando cum
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uno arcu Eclipticæ, ſeu Zodiaci maior arcus Aequatoris aſcendat, aliquando
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minor docet iam ſignum illud: </
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<
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">ſiue arcum Eclipticæ, cum quo maior arcus
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Aequatoris cooritur, dici oriri recte: </
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<
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">cum quo uero minor arcus Aequatoris
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coaſcendit, oriri oblique. </
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<
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">Pari ratione ſignum, uel arcum Eclipticæ, cum quo
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maior arcus Aequatoris ſub Horizontem tendit, occidere recte: </
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ro minor, oblique.</
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<
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. </
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">Romæ cum arcu Libræ, qui comprehendit grad. </
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ſcendit arcus Aequatoris continens grad. </
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<
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">Quare ſignum ♎, dice-
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tur oriri recte: </
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">At cum arcu Arietis coaſcendunt grad. </
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<
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ris, idcirco dicetur ſignum ♈, oriri oblique. </
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">Similiter quia cum ſigno ♈, de-
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ſcendunt grad. </
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<
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<
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<
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dere oblique, quia deſcendunt tantum grad. </
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<
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<
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<
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infra Horizontem, &</
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<
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prior ortus, & </
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">occaſus, quando nimirum plures gradus Aequa-
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caſus rect’,
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uel obliqu’
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cur ſic dica
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tur.</
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toris cooriuntur, uel ſimul occidunt, rectus, quia tunc rectiores angulos efficit
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arcus ille Zodiaci exoriens, uel deſcendens, cum Horizonte: </
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<
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ortus, & </
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<
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">occaſus, quando ſcilicet pauciores gradus Aequatoris aſcendunt ſi-
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mul, uel deſcendunt, uocatur obliquus, quoniam arcus ille Zodiaci emergẽs,
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uel occumbens obliquiores angulos cum Horizonte conſtituit. </
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<
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perſpicua ſunt in ſphæra materiali. </
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<
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">Vnde arcus Zodiaci, cum quo æqualis
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arcus Aequatoris peroritur, uel occidit, dici poterit oriri, & </
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modo: </
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<
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">cuiuſmodi ſunt quatuor Quadrantes zodiaci in ſphæra recta. </
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enim ſinguli cum ſingulis Quadrantibus Aequatoris, ut ſtatim dicemus.</
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</
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<
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autem, quem ſequuntur omnes Aſtronomi, Aſcenſiones
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">Aſcẽſiones
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rectæ, uel
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obliquæ a-
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pud Ptolo-
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mæũ & A-
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ſtronomos
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quæ.</
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rectas uocat eas omnes, quæ fiunt in ſphæra recta: </
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in ſphæra obliqua habentur, ſiue maior arcus Aequatoris, minorve, ſiue æqua
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lis cooriatur. </
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<
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<
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">eas appellant Aſtronomi in tabulis aſcenſionum. </
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<
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de recta aſcenſio alicuius arcus, ſiue gradus Eclipticæ, apud ipſos ſumitur pro
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aſcenſione, quam habet in ſphæra recta, ſiue maior arcus cum eo oriatur, ſi-
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ue minor: </
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<
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">obliqua uero aſcenſio cuiuſque arcus intelligitur ea, quam habet
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in ſphæra obliqua, cum quantocunque arcu Aequatoris ipſe coaſcẽdat. </
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<
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dicendum eſt de Deſcenſionibus rectis & </
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