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

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16
THEODOSII
SPHAERICORVM
LIBER PRIMVS.
6[Figure 6]
DEFINIT IONES.
I
SPHAERA eſt figura ſolida compre-
henſa vna ſuperficie, ad quam ab vno
eorum punctorum, quæ intra figuram
ſunt, omnes rectæ lineæ ductæ ſunt in-
ter ſe æquales.
II.
Centrum autem Sphæræ, eſt eiuſmodi punctũ.
III.
Axis verò Sphæræ, eſt recta quædã linea per cen
trũ ducta, &
vtrin que terminata in ſphæræ ſuper-
ficie, circa quã quieſcentẽ circumuoluitur ſphęra.
IIII.
Poli ſphæræ ſunt extrema puncta ipſius axis.
V.
Polus Circuli in Sphæra, eſt punctum in ſuper-
ficie ſphæræ, à quo omnes rectæ lineæ ad Circuli
circumferentiam tendentes ſuntinter ſe æquales.

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