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

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352340 non neceſſarias reiecimus, & alias non paucas
ab eo omiſſas ex Gebro Hiſpalenſi, Ioanne Re-
giom.
Franciſco Maurolyco, & ex alijs adie-
cimus, quas omnino neceßarias eſſe iudic aui-
mus ad res Aſtronomicas intelligendas.
Ple-
run{que} etiam nouas demonſtrationes, eas{q́ue} bre-
uiores, ac faciliores adhibuimus, nonnullas item
eodem modo demõſtrauimus, quoeædem de an-
gulis, &
triangulis rectilineis demonſtratæ ſunt
ab Euclide, vt planior fieret earum demonſtra-
tio:
ex quarum numero ſunt propoſ. 5. 6. 7. 8.
& 9. Non parumtamen operæin eo poſuimus,
vt omnes propoſitiones triangulorum Sphærico-
rum it a in ordinem redigeremus, vt poſteriores
ex prioribus penderẽt, quemadmodum res Ma-
thematicæ poſtulant, &
in omnibus elementis
Geometricis fieri conſueuit Sed iam ad rem ve-
niamus, exordio ſumpto à definitionibus.
DEFINITIONES.
I.
ANGVLVS ſphæricus eſt, quem in ſphærę
11Angulus
fphæricus
quid.
ſuperficie duo arcus circulorum maximorum ſe-
ſe mutuo ſecantes continent.
_QVONIAM_ angulus ſphæricus, qui à Geometris in ſphærica ſuperficie conſia
deratur, ab arcubus maximorum circulorum tantummodo conſtituitur, omnes

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