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

10. THEODOSII
SPHAERICORVM
LIBER PRIMVS.

016-01

11. 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.

12. II.

Centrum autem Sphæræ, eſt eiuſmodi punctũ.

13. III.

Axis verò Sphæræ, eſt recta quædã linea per cen
trũ ducta, & vtrin que terminata in ſphæræ ſuper-
ficie, circa quã quieſcentẽ circumuoluitur ſphęra.

14. IIII.

Poli ſphæræ ſunt extrema puncta ipſius axis.

15. 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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