Clavius, Christoph, In Sphaeram Ioannis de Sacro Bosco commentarius

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Origo autem, & cauſa huius diuiſionis ſphęrę in rectam, & obliquam
11Rotũditas
terræ
cauſa
eſt
ſphæræ
rectæ
& ob-
liquę
.
eſt rotunditas terrę.
Cum enim vt ſuo loco demonſtrabimus, terra ſit rotunda,
ſit
, vt ſitus polorum, &
totius ſphęrę mutetur in diuerſis terrę partibus, ita vt
homines
uerſus alterum polorum procedentes ſemper eum magis ac magis
eleuatum
intueantur;
Quod non accideret, ſi terra eſſet plana. Præterea, quo-
niam
ubicunque homo fuerit, &
in quacunque orbis terreni parte extiterit,
ſemper
uidet mediam partem cœli, ſecluſis montium, &
uallium impedimen-
tis
, ut a Ptolemęo, Alphragano, &
alijs Aſtronomis uarijs eſt phęnomenis com
pertum
, quam quidem medietatem viſam a non uiſa dirimit Horizon;
Effici-
tur
, ut in qua regione unus polus in Horizonte iacet, alter ẽt in eodẽ exiſtat.
Item quantum alter polorum ſupra Horizontem attollitur, alter quoque ran-
tum
ſub eodem deprimatur;
Alias aut plus, aut minus, quàm medietatem cęli
conſpiceremus
, cum poli per dimidiam cęli partem a ſe inuicem diſtent, nem-
pe
qui per diametrum mundi opponantur.
Quare neceſſe eſt, ut homo in ali-
qua
magna campi planitie conſtitutus habeat aut utrumque mundi polum (re-
motis
omnibus impedimentis montium ac uallium) in Horizonte iacentem,
quando
nimirum Horizon per mundi polos incedit, aut unum eleuatum, &
al
terum
depreſſum, quando uidelicet Horizon per polos mundi minime tran-
ſit
.
Ex his igitur omnibus euidenter conſtat ratio diuiſionis ſphęrę in rectam &
obliquam
.

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