Full text: Bithynius, Theodosius: Theodosii Tripolitae Sphaericorum libri tres

450. BAMBER GENSIS E
SOCIETATE IESV
TRIANGVLA RECTILINEA.
PRÆFATIO.

SINVVM, linearum tan-
gentium, & ſecantium vſus
potißimum in doctrina trian-
gulorum tam rectilineorum,
quàm ſphæricorum conſiſtit. Omnes enim Aſtronomi in mo
tibus cæleſtibus vel inueſtig andis, vel explican-
dis explorant in triangulis beneficio ſinuum, li-
nearum tang entium, & ſecantium tumlatera
ex angulis notis, tum etiam angulos ex lateribus
cognitis. Id quod ex Epitoma Ioan. Regiom. in
Almageſtum, ſiue magnam cõſtructionem Pto-
lomæi, ex opere Copernici dereuolutionibus cæle-
ſtibus, & ex aliorum Aſtronomorũ ſcriptis per-
ſpicuè conſtare potest. Quam ob rem cum iarn
tractationem ſinuum, linearum{q́ue} tangentium,
ac ſecantium abſoluerimus, ordo poſtulat, vt
ſciẽtiam hanc triang ulorum à Foanne Regiom.

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