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

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10593
THEOREMA 12. PROPOS 12.
1114.
Slin ſphæra maximi circuli tangant vnum, eun
demq́;
parallelorum, intercipiantq́; ſimiles paralle-
lorum circunferentias inter vtrũque maximorum
circulorum interiectas;
alius autem maximus cir-
culus ad parallelos obliquus circulos tangat ma-
iores illis, quos tangunt maximi circuli primò po-
ſiti, ſecetq́;
obliquus idem circulus eoſdem maxi-
mos circulos primò poſitos in punctis poſitis in-
ter maximum parallelorum, &
circulum, quem tan
gunt circuli maximi primo poſiti:
Diameter ſphæ
ræ ad diametrum circuli, quem tangit obliquus
circulus, maiorem rationem habet, quàm circun-
ferentia maximi paralleli intercepta inter circulos
primo poſitos, eundemq́;
circulum tangentes ad
circunferentiam obliqui circuli inter eoſdem cir-
culos interceptam.
IN ſphæra duo maximi circuli AB, CD, tangant eundem parallelum
AC, intercipiantq́;
ſimiles paralle-
109[Figure 109] lorum circunferentias inter ipſos in-
teriectas;
alius autem circulus maxi-
mus EF, tangat parallelum EG, ma-
iorem parallelo AC, in E, ſitque o-
bliquus ad parallelos, &
ſecet duos
priores AB, CD, inter maximum pa
rallelorum HF, &
parallelum AC,
in punctis I, K.
Dico maiorem eſſe
rationem diametri ſphæræ ad diame-
trum paralleli EG, quàm circunfe-
rentiæ BD, ad circunferentiam IK.
Per L, enim polum parallelorum, &
puncta E, I, K, maximi circuli deſcri-
2220.1.huius. bantur LH, LM, LN;
ac per K, pa-
rallelus KO, ſecanscirculum AB, in P.
Quoniam igitur maior eſt ratio dia-
metri ſphæræ ad diametrum circuli EG, quàm arcus HM, ad arcum EI;
ra-
3311.huius.

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