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.
DEFINITIONES.
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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