Definition: Def. 11.15: Axis of a Sphere
And the axis of the sphere is the fixed straight line about which the semicircle (constructing the sphere) is turned.
Modern Formulation
(not yet contributed)
Thank you to the contributors under CC BY-SA 4.0! 
- Github:
-
- non-Github:
- @Fitzpatrick
References
Adapted from (subject to copyright, with kind permission)
- Fitzpatrick, Richard: Euclid's "Elements of Geometry"
Adapted from CC BY-SA 3.0 Sources:
- Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016
