Clavius, Christoph
,
In Sphaeram Ioannis de Sacro Bosco commentarius
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Comment. in I. Cap. Sphæræ
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<
emph
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accidens autem diuiditur in ſphæram rectam, & </
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>
<
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xml:space
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xlink:label
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note-058-01
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xml:space
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">Diuiſio
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ſphæræ ſe-
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cundum ac
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cidens.</
note
>
ram obliquam. </
s
>
<
s
xml:id
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xml:space
="
preserve
">Illi autem dicuntur habere ſphæram rectam, qui manent ſub
<
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Aequinoctiali, ſi aliquis ibi manere poſſit. </
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>
<
s
xml:id
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echoid-s1033
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xml:space
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">Et dicitur eis recta, quia neuter
<
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polorum magis altero illis eleuatur. </
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<
s
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xml:space
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">Vel quoniam eorum Horizon interſe-
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cat Aequino ctialem, & </
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>
<
s
xml:id
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echoid-s1035
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xml:space
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">interſecatur ab eodem ad angulos rectos ſphærales.
<
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</
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<
s
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xml:space
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">Illiuero dicuntur habere ſphæram obliquam, quicunque habitant citra Ae-
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quinoctialem, uel ultra. </
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>
<
s
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xml:space
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preserve
">Illis enim ſupra Horizontem alter polorum ſemper
<
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eleuatur, alter uero ſemper deprimitur: </
s
>
<
s
xml:id
="
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xml:space
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preserve
">Vel quoniam illorum Horizon ar-
<
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tificialis interſecat Aequinoctialem, & </
s
>
<
s
xml:id
="
echoid-s1039
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xml:space
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">interſecatur ab eodem ad angulos
<
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impares, & </
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>
<
s
xml:id
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xml:space
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">obliquos.</
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<
s
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<
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xml:space
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">COMMENTARIVS.</
head
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<
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>
iam ſphæram ſecundum accidens in ſphæram rectam, & </
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>
<
s
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xml:space
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">obli-
<
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quam. </
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>
<
s
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xml:space
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">Sed quoniam ea, quæ in hac diuiſione dicuntur, & </
s
>
<
s
xml:id
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xml:space
="
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">quæ deinceps ſequũ
<
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tur, intelligi non poſſunt, niſi prius qui iam circuli ſphæræ cognoſcantur, quo-
<
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/>
rum in ſequentibus frequenter fit mentio; </
s
>
<
s
xml:id
="
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xml:space
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">operæpretium me facturum puto,
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ſi breuiter, & </
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>
<
s
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xml:space
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">generatim circulos ſphæræ explicauero, plura de illis, eorumque
<
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officijs, nominibusq́ue in 2. </
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>
<
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">cap. </
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<
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">diſputaturus, ubi de eiſdem differit auctor:
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</
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<
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xml:space
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">Nunc enim tantum rudi minerua vocabula circulorum exponam.</
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>
<
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</
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</
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<
head
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xml:space
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">DE CIRCVLIS SPHAERAE.</
head
>
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<
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">GIrcvli</
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>
ſphæræ ſunt 10. </
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>
<
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xml:space
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">quorum hæc ſunt nomina. </
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<
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xml:space
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">Aequino-
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xlink:label
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xlink:href
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xml:space
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">Decem cir-
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@uli ſphęrę.</
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ctialis, Zodiacus, Colurus ſolſtitiorum, Colurus æquinoctiorum,
<
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/>
Meridianus, Horizon, Tropicus Cancri, Tropicus Capricorni,
<
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Circulus arcticus, & </
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<
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">circulus antarcticus. </
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<
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xml:space
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">Priores ſex, maiores di-
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cuntur, ſiue maximi, poſteriores quatuor, minores, ſiue non maxi-
<
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xml:space
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">Maior cir
<
unsure
/>
-
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@ulus ſphæ-
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ræ, & mi-
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@or quid.</
note
>
mi. </
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>
<
s
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xml:space
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">Maior circulus dicitur is, qui idem centrum cum ſphæra obtinet, ipſamq́ue
<
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ſphæram in duo hemiſphæria æqualia diuidit: </
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>
<
s
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xml:space
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">Minor uero circulus appellatur
<
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ille, qui diuerſum centrum a ſphæræ centro poſſidet, ſphæramq́ue in duo ſeg-
<
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/>
menta inæqualia patitur. </
s
>
<
s
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xml:space
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">Cæterum quilibet circulus ſphæræ, ſiue maior, ſiue
<
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minor, duos dicitur habere polos, circa quos, ſi moueretur, uniformiter ferre-
<
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tur. </
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>
<
s
xml:id
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xml:space
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">Immo ex polis ipſis omnes circuli in ſuperficie ſphæræ deſcribuntur. </
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<
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</
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<
s
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xml:space
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">polus cuiuslibet circuli fphæræ, punctum illud in conuexa ſuperficie ſphæræ, a
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">Polus circu
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li in ſphæra
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quid,</
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>
quo omnes lineæ rectę ad circunferentiam circuli ductę ſunt ęquales. </
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>
<
s
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xml:space
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">Nam
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cum ex polo circuli circunferentia deſcribatur, neceſſe eſt, vt polus ęqualiter re
<
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cedat ab omnibus punctis illius circunferentię.</
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<
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</
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<
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<
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<
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>
scirculus in ſphæra dicitur ille maior, qui ex mun
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<
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">Aequino-
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ctialis.</
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di polis eſt deſcriptus, ęqualiterq́. </
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<
s
xml:id
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xml:space
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">ab vtroque polo mundi ſecundum omnes
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ſui partes remouetur.</
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</
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<
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<
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<
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>
circulus eſt quoque maior, deſcriptus ex polis diſtantibu@
<
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<
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>
a mundi polis quarta parte, & </
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>
<
s
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">inſuper nonageſima unius quadrantis, hoc eſt,
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partibus 47. </
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<
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">ex 180. </
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>
<
s
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">in quas quadrans diuidi intelligitur, qui ſecat ęquinoctia-
<
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lem, ſecaturq́ue uiciſſim ab eodem in duas medietates, oblique tamen; </
s
>
<
s
xml:id
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">ita ut
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Zodiacus ad Æquinoctialem ſit inclinatus, unaq́ue medietas uergat ad </
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