Clavius, Christoph
,
In Sphaeram Ioannis de Sacro Bosco commentarius
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Comment. in I. Cap. Sphæræ
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ſemper apparentium, alter uero maximus ſemper occultorum; </
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<
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24. </
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<
s
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xml:space
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">horas inæquales, quando nimirum neque per mundi polos incedũt, neque
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dictos parallelos contingunt, ſed diuidunt omnia ſegmenta parallelorum ſu-
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pra Horizontem, itemq́; </
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<
s
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echoid-s8991
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xml:space
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">infra Horizontem exiſtentia, in 12. </
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<
s
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">partes æquales:
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</
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<
s
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xml:space
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">ſed de hac uarietate horarum plura dicemus in 3. </
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<
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xml:space
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">cap. </
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<
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<
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">Circvli</
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domo-
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<
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xlink:label
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note-258-01
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xlink:href
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note-258-01a
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xml:space
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">Citculi do-
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morum cœ
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leftium, &
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poſitionũ.</
note
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rum cęleſtium, qui totum cęlum in 12. </
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<
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xml:space
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">partes ſecant, quæ domus cęleſtes di-
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cuntur. </
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<
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poſitionnm, qui per communes ſectiones Horizon-
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tis, & </
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>
<
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">Meridiani, necnon per centrum cuiuſque ſtellæ tranſire definiuntur.
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</
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<
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declinationum, qui per polos mundi, & </
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xml:space
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">ſingula Æquatoris
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xlink:label
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note-258-02
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xml:space
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">Circuli de
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clinationũ,
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& latitudi-
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num.</
note
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puncta educuntur. </
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<
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latitudinum, qui per polos Zodiaci, & </
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gula Eclipticæ puncta deſcribuntur. </
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<
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xml:space
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">Denique quamplurimi alij circuli repe-
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riuntur apud Aſtronomos. </
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xml:space
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">Vt enim maximos omittamus, conſiderantur pro-
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pemodum infiniti circuli non maximi. </
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<
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xml:space
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">Nam quilibet maximus habet ſuos pa-
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rallelos: </
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<
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xml:space
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">Vt Horizon habet circulos parallelos circa verticem capitis deſcri-
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ptos, qui dici ſolent circuli altitudinum. </
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xml:space
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">Aequator habet parallelos circulos
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circa polos mũdi deſcriptos, cuiuſmodi ſunt illi circuli, quos ſingulæ ſtellæ, & </
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planetæ, ſiue puncta cęli quælibet, ad motum diurnum deſeribunt quotidie.
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</
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">Zodiacus habet quoq; </
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">ſuos parallelos circa polos Zodiaci deſcriptos, quales
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ſunt ij, quos fingulæ ftellæ & </
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<
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xml:space
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">planetæ, ſeu quælibet puncta cęli, ad motum pro
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prium nonæ Sphæræ ab occidente in orientem conficiunt. </
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<
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">Idemq́ue dicẽdum
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eſt de alijs circulis maximis. </
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<
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xml:space
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">Verum de his circulis omnibus agendum eſt alio
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in loco; </
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<
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">Satis enim nunc nobis erit, decem illos priores, qui primarij dicũtur,
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in hoc 2. </
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<
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">quoniam hi proprie ad ſphæram ſpectant.</
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<
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in ſphæra illi circuli, qui idem cum ſphæra centrum poſ-
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ſident, maximi, ſiue maiores, quia, ut demonſtrat Theodoſius lib. </
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<
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</
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">Maximi cir
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culi, & non
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maximi in
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ſphæra cur
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ſic dicti.</
note
>
circuli, qui per ſphæræ centrum dncuntur, ſunt omnium maximi, ita ut maior
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illis dari non poſſit: </
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<
s
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">quemadmodum etiam linea, quæ in circulo aliquo per cẽ
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trum ducitur, nempe diameter, eſt omnium maxima. </
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<
s
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">Illi autem circuli, quo-
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rum centrum diuerſum eſt à centro ſphæræ, appellantur non maximi, ſiue mi
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nores, quoniam, ut Theodoſius demonſtrat loco citato, circuli, qui non per
<
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centrum ſphæræ ducuntur, minores exiſtunt ijs, qui per centrum ſphæræ tran
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ſeunt, & </
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<
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">quo remotiores à centro ſphæræ fuerint, eo etiã minores efficiuntur.</
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<
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<
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autem ea, quæ de circulis cęleſtibus dicenda erunt, perfectius intelli-
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gantur, adducam in medium aliquot proprietates circulorum ſphæræ tam ma
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iorum, quàm minorum, demonſtratas à Theodoſio in ſphæricis elementis. </
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<
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quibus quidem multa in ſequentibus ſunt demonſtranda.</
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<
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<
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circuli ſphæræ maximi ſecant feſe mutuo bifariam, & </
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<
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<
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tes nonnul-
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la circulo-
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@ũ in ſphæ-
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ra.</
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culi in ſphæra ſeſe mutuo bifariam ſecantes, ſunt maximi. </
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<
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Theod. </
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<
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<
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<
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<
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<
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circuli ſphæræ maximi ſunt inter ſe æquales. </
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<
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cile conſtat ex æqualitate diametrorum. </
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<
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">Eſt enim cuiuſlibet circuli maximi
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diameter eadem, quæ diameter ſphæræ. </
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<
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">Imo
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ſi alter altero eſſet maior, non
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eſſet uterque inaximus. </
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<
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">Minor enim illorum maximus non eſſet, cum alter eo
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maior detur.</
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