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

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11199
CHRISTOPHORI CLAV II
BAMBERGENSIS
E SOCIETATE IESV
SINVS, VEL SEMISSES RECTARVM
in circulo ſubtenſarum:
LINEÆ TANGENTES, ATQVE
SECANTES.
PRÆFATIO.
DICI vix poteſt, quantam in
11Sinuũ vti-
litas.
rebustã Aſtronomicis, quàm
Geometricis, vtilitatẽ babeat
Sinuũ cognitio:
cũ innumera-
bilia peneproblemata Aſtro-
nomica, &
Geometrica ad
vſumper calculum &
rationem Sinuũreuocen
tur, vt tumex noſtris triangulis rectilineis, ac
sphæricis, tum ex Almageſto Ptolemæi, ex noſtra
Gnomonica, &
exalijs variorum Aſtronomo-
rum libris manifeſtumeſt.
Quare, cum à paucis
admodum Sinuum demonſtrationes ſint expli-
catæ, operæpretiũme facturum arbitror, ſi, quan
ta potero breuitate, ac perſpicuitate, ex varijs
auctoribus, præſertim ex Ptolemæo,

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