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

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

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112100 atque Iohanne Regiomontano, demonſtrationes
colligam, quibus omnium arcuum ſinus & chor-
das cognitas babeamus, vt & tabulas Sinuum,
ac chordarumiam à multis ſcriptoribus ſuppu-
tatas examinare, (facile enim error in numero-
rum impreßione committitur) & nouas alias,
quandores tulerit (poſito Sinu toto vel diame-
tro quotcunq; particularum) condere poßimus.

QVONIAM vero Recentiores ſumma
felicitate ex ſinubus alias lineas collegerũt, nimi-
rum Tangentes, atque Secantes, vt facilius
quædam, ac breuius demonſtrarent; de biſce e-
tiam lineis agemus. Habent enim lineæ hæ egre-
gium vſum in rebus Aſtronomicis & Geome-
tricis, vt ex noſtris triangulis planis, ac sphæri-
cis fiet per ſpicuum. Initium autem ſumemus à
definitionibus.

I.

COMPLEMENTVM arcus alicuius, eſt
11Comple-
mentũ at-
ous quid. exceſſus, quo quadrans eum ſuperat, ſi arcus mi-
nor eſt quadrante, vel ab eo ſuperatur, ſi eſt qua-
drante maior.

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