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

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9078 K I, K L, vtroque K Y, K X, maior eſt. Et quoniam recta per K, & ſphęræ centrũ
ducta, id eſt, communis ſectio maximorum circulorum G H, E Y, ſecat pla-
num paralleli Q R, extra ſphæram, ſi recta illa, &
planum circuli Q R,
producantur ad partes K, vt in demonſtratione propoſ.
5. huius lib. dictum
eſt;
erit arcus K Y, maior arcu K X: Sed arcui K Y, arcus M O, & arcui K X,
114. huius. arcus O Q, æqualis eſt;
Sunt enim ſemicirculi, quorum vnus ex A, per B, al-
2213. 2. huius ter vero ex E, per K, ducitur, non conuenientes, vt ex ijs, quæ in demonſtra-
tione propoſ.
13. ſecundi lib. diximus, perſpicuum eſt. Igitur & arcus M O, ma-
ior erit arcu O Q.
Siergo in ſphæra maximus circulus tangat, & c. Quod
demonſtrandum erat.
THEOREMA 8. PROPOS. 8.
336.
SI in ſphæra maximus circulus aliquem ſphæ-
ræ circulum tangat, aliquis autem alius maximus
circulus obliquus ad parallelos tangat circulos ma
iores illis, quos tangebat maximus circulus primo
poſitus, fuerintque eorum contactus in maximo
circulo primo poſito;
ſumantur autem de obliquo
circulo æquales circunferentiæ continuæ ad eaſ-
dem partes maximi parallelorum, perque puncta
terminantia æquales circunferentias deſcribantur
maximi circuli, qui &
tangant eundem circulum,
quem tangebat maximus circulus primo poſitus,
&
ſimiles parallelorú circunferentias intercipiant,
habeantque eos ſemicirculos, qui tendunt à pun-
ctis contactuum ad puncta terminantia æquales
obliqui circuli circunferentias, per quæ deſcribun-
tur, eiuſmodi, vt minime conueniant cum illo cir
culi maximi primo poſiti ſemicirculo, in quo eſt
contactus obliqui circuli inter apparentem po-
lum, &
maximum parallelorum: Inæquales

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