Theodosius <Bithynius>; Clavius, Christoph, Theodosii Tripolitae Sphaericorum libri tres

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6351 les, ſit A E, maior. Erit igitur circulus A B, minor circulo C D. quod eſt con-
72[Figure 72]1117. huius. tra hypotheſim.
Sunt ergo ęquales arcus A E,
E C, nec non B F, F D.
QVOD ſi circulus A B, maior po-
natur circulo C D;
Dico arcum A E, mino-
rem eſſe arcu E C.
Si enim non eſt minor,
erit vel æqualis, vel maior.
Si æqualis, erunt
circuli A B, C D, æquales:
ſi maior, erit cir-
2217. huius. culus A B, minor circulo C D, quorum vtrũ-
3317. huius. que eſt cõtra hypotheſim.
Minor ergo eſt ar-
cus A E, quam E C.
Quamobrem In ſphæra
circunferenriæ maximorum circulorum in-
terceptæ, &
c. Quod oſtendendũ erat.
THEOR. 17. PROPOS. 19.
4423.
SI in ſphæra maximus circulus parallelos ali-
quot circulos in ſphærica ſuperficie deſcriptos ſe-
cet quidẽ, non tamen per polos, in partes inæqua-
les eos ſecabit, excepto maximo parallelorum:
De
parallelorum autem ſegmentis in vno hemiſphæ-
riorum interceptis, ea quæ ſunt inter maximum
parallelorum, &
polum conſpicuum, ſunt maiora
ſemicirculo;
reliqua vero, quæ ſunt inter maximũ
parallelorum, &
polum occultum, ſunt ſemicircu
lo minora:
Æqualium denique ac parallelorum cir
culorum alterna ſegmenta ſunt inter ſe æqualia,
IN ſphęra maximus circulus A B C D,
parallelos E F, G H, I K, ſecet in L, M;
B,
73[Figure 73] D;
& O, P, non per polos, qui ſint Q, R; &
fit G H, parallelorum maximus, &
Q, polus
conſpicuus, &
R, occultus in hemiſphęrio,
quod ſupra circulum maximum A B C D, ex
tat, &
ad partes F, vergit. Dico circulum
A B C D, parallelos non bifariam ſecare, ex
cepto maximo G H;
hunc enim bifariam ſe-
5511. 1. huius cat:
ſegmentum autem L F M, inter maximũ
parallelum, &
polum Q, conſpicuum ſemicir
culo eſſe maius, &
O K P, minus. Si denique
paralleli E F, I K, ęquales ſint, alterna

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