Clavius, Christoph
,
In Sphaeram Ioannis de Sacro Bosco commentarius
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Comment. in II. Cap. Sphæræ
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<
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<
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hic duos circulos polares: </
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<
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<
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lares ꝗ ſin@.</
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qui deſcribuntur motu primi mobilis à poli Zodiaci circa polos mundi. </
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<
s
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de quoniam diſtantia polorum Zodiaci à polismundi æqualis eſt maximæ
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Solis declinationi, vt paulo ſuperius demonſtrauimus, efficitur, ut uterque
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<
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">Polares cir-
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culi quan-
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tum à polis
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mundi ab
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ſint.</
note
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circulus polaris tantum abſit à polis mundi, (Arcticus quidem à polo Arcti-
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cto, Antarcticus uero ab Antarctico) quantum ab Æquatore reced unt duo
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Tropici, nimirum grad. </
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<
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<
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<
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<
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</
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<
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<
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, vt videre licet apud Proclum, & </
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<
s
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xml:space
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">Cleomedem, multo aliter in-
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telligunt duos circulos polares. </
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<
s
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xml:space
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">Non enim cum Latinis circulos polares ap-
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<
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xlink:label
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xlink:href
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xml:space
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">Polares cir-
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culi quomo
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do à Græ-
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cis ſumãtur</
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pellant eos, qui à Zodiaci polis deſcribũtur, ſed apud ipſos duo circuli dicun
<
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tur polares, quorũ alter eſt maximus parallelorũ ſemper apparentiũ, alter ue-
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ro maximus ſemper deliteſcentiũ de quibus in officio 7. </
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<
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">Horizontis egimus.
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</
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<
s
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">Maluerunt autẽ Græci potius hoc modo definire circulos polares, ut per ip-
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ſos cognoſcantur omnes ſtellæ, quæ nunquam oriuntur, & </
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<
s
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">occidunt, ſed uel
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perpetuo apparent, ut ſunt illæ, quas Arcticus includit, uel perpetuo latent,
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quales ſunt eæ, quas comprehendit Antarcticus. </
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<
s
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xml:space
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">Ex quibus perſpicuum eſt,
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apud Græcos duos circulos polares non eſſe eiuſdem quantitatis in omnibus
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regionibus, quemadmodum apud Lations, ſed quo obliquior ſphæra fuerit, eo
<
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etiam maiores eos effici, ut ſupra de maximo paralle lorum ſemper apparen-
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tium, & </
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<
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">maximo ſemper occultorum dictum eſt.</
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</
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<
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<
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quatuor prædicti circuli minores: </
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<
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">tropici uidelicet, atque po-
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lares, æquidiſtant Aequatori, ut conſtat ex propoſ. </
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<
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<
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<
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<
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">Theod. </
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<
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">propterea,
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quod eoſdem polos poſſident, quos Aequator, nempe polos mundi, ex qui-
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bus deſcribũ tur. </
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<
s
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xml:space
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">Et quamuis quiuis circulus in ſphæra maximus ſuos habeat
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parallelos, ut initio huius cap. </
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<
s
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">diximus, præcipua tamen apud Aſtronomos ra
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tio habetur parallelofũ Aequatoris, & </
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">Zodiaci. </
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">Nam ſingulæ ſtellæ, punctave
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cœli Aequatori ſingulos circulos æquidiſtantes deſcribunt ad motum diur-
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num primi mobilis: </
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<
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">Ad motum uero nonæ ſphæræ ab occaſu in ortum de-
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lineant circulos æquidiſtantes Zodiaco. </
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<
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">Inter omnes autem circulos paral-
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lelos Aequatoris inſigniti ſunt peculiaribus nominibus quatuor hi minores,
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quos auctor noſter explicauit.</
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</
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<
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<
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autem Aequator, ſeu circulus quilibet maximus in
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ſphæra diſtribuitur in 360. </
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<
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">grad. </
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<
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">ita etiam, ut ſupra monuimus, circulus qui-
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cunque minor in totidem gradus ſecatur, qui omnino ſimiles ſunt gradibus
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maximi circuli, ut ex propoſ. </
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<
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<
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<
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<
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">Theod. </
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<
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xml:space
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">colligitur, ita ut quàm propor-
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tionem habet circulus maximus ad circulum non maximum, eandem ſeruent
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ſinguli gradus maximi circuli ad ſingulos gradus circuli non maximi.</
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</
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<
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<
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<
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autem ex do ctrina ſinuum proportio circuli maximi ad cir
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<
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circuli ma-
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@ imi ad nõ
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maximum
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qua ratione
<
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ex ſinubus
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@ognoſca-
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tur.</
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culum nõ maximum, cuius declinatio nota fuerit, hac ratione. </
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<
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">Multiplicetur
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ſinus complemẽti declinationis circuli non maximi per circulum integrum,
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hoc eſt, per grad. </
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<
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<
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xml:space
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">& </
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<
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">numerus productus diuidatur in ſinũ totum, habebi-
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turq; </
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<
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<
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circulus. </
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<
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xml:space
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">Vt enim in Coſmographia oſtendimus, quemadmodum ſe habet ſi-
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nus totus ad ſinum cõplementi declinationis cuiuſuis paralleli, ita ſe habet
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circulus maximus ad propoſitum circulum non maximum. </
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<
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. </
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<
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poſitum ſit perquirere, quam proportionem habeat Aequator ad </
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