Clavius, Christoph
,
In Sphaeram Ioannis de Sacro Bosco commentarius
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Ioan. de Sacro Boſco.
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ſus auſtrum, in tantum poſſet procedere, quòd ſtellę, quæ prius erant ei
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ſempiternæ apparitionis, ei iam tenderent in occaſum; </
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<
s
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xml:space
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">quanto magis
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accederet ad auſtrum, tanto plus mouerentur in occaſum. </
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<
s
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xml:space
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">Ille iterum idem
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homo poſſet uidere ſtellas, quæ prius fuerant eiſempiternæ occultationis:
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</
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<
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<
s
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xml:space
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">e conuerſo contingeret alicui procedenti ab auſtro uerſus ſeptentrionem. </
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Huius autem rei cauſa eſt tantum tumor terræ.</
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<
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<
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>
hic partem antecedentis, quòd nimirum terra rotun
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da etiam ſit a ſeptentrione in auſtrum, confirmat hac ratione. </
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<
s
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xml:space
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">Dubium no@
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eſt, quin aliquæ ſtellæ fixæ nobis in ſphæra obliqua, & </
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<
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xml:space
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">in partibus ſeptentrio-
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nalibus degentibus ſemper appareant, illæ nimirum, quæ ſunt prope polum ar
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cticum: </
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<
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">quædam uero ſemper deliteſcant, illæ videlicet, quæ prope polum an-
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tarcti
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cum exiſtunt. </
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<
s
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xml:space
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">Rurſus compertum eſt, ſi aliquis a ſeptentione in auſtrum
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procederet directe, hoc eſt, ſub eodem ſemper Meridiano, illæ ſtellæ, quæ illi
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/>
ſemper ante apparebant, occultari inciperent: </
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<
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xml:space
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">& </
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>
<
s
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xml:space
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">contra illæ, quas ante uidere
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non poterat iuxta polum antarcticum, paulatim ſeſe ſupra Horizontẽ extolle
<
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rent, atque ſub conſpectum uenirent: </
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<
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xml:space
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">Videmus enim in Germania, quæ eſt ſe-
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ptentrionalior, plures ſtellas perpetuo apparere, quàm in Italia, quæ minus ſe-
<
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ptentrionalis eſt: </
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<
s
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xml:space
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">contra autem in Italia plures ſſellas conſpici in parte auſtra-
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li, quàm in Germania. </
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<
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">Signum ergo eſt manifeſtum, terram eſſe rotundam à ſe-
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ptentrione in auſtrum; </
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<
s
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">quemad modum cauſa, cur, cum montem aliquem rotũ
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dum conſcendimus, res, quas antea non uidebamus, incipimus uidere, & </
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">quas
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ante conſpiciebamus, amplius intueri non poſſumus, eſt tantum tumor montis.</
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<
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ex his tantum colligi uidetur, terram a ſeptentrione in auſtrum
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">Rotundita
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tem terræ
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eſſe ſphæri-
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cam.</
note
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eſſe rorundam aliquo modo, hoc eſt, minime planam exiſtere, non autem, quòd
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ſit figuræ ſphæricæ. </
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<
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xml:space
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">Vnde idipſum hoc modo confirmandum erit
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. </
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<
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xml:space
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">Quando ali-
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quis ſub eodem ſemper Meridiano exiſteu
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s a ſeptentrione in auſtrum pergit,
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deprehendit continue eleuationem poli ſupra Horizontem decreſcere, hac ſer
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uata proportione, ut ſi in uno loco altitudo poli eſt, v.</
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fecerit uerſus auſtrum 62. </
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">milliaria, reperiat polum eleuaritantum grad. </
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</
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<
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">& </
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<
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">ſic deinceps, quotieſcunque 62. </
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<
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">milliaria confecerit, inueniat altitudinem
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poli decreuiſſe per unum gradum. </
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<
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">Neceſſe igitur eſt, terram eſſe ſphæricam
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a ſeptentrione in auſtrum. </
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<
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">Hæc enim proportio decrementi altitudinis poli
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figuræ duntaxat ſphæricæ conuenire poteſt, ut manifeſtum eſt apud Geome-
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tras, & </
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<
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pacto oſtendetur, terram ab ortu in occaſum non eſſe quocun-
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que modo rotundam, ſed ſphæricam. </
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<
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">Nam illa anticipatio ortus, & </
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">occaſus So
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lis, nec non meridiei, proportionem ſupradictam (ut nimirum ciuitati illi, quę
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altera orientalior cſt quindecim gradibus, una hora citius Sol oriatur, & </
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dat; </
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<
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">illi autem, quæ magis eſt orientalis triginta gradibus, duabus horis citius,
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& </
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<
s
xml:id
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">ſic de reliquis) minime ſeruare poteſt, niſi ſphæricam figuram terræ attribua
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mus. </
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<
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</
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<
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ſi terra eſſet plana ab oriente in occidentem, tam cito ori-
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<
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eſſe planã.</
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rentur ſtellæ occidentalibus, quàm orientalibus, quod patet eſſe fal
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ſum.
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</
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<
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