"Patrick Kessler" <[EMAIL PROTECTED]> writes: > Can anyone recommend an essay on steriographic projection? In particular I > am searching for a proof that circles on the sphere are mapped onto the > equatorial plane as circles.
http://www.geom.umn.edu/docs/doyle/mpls/handouts/node33.html "outline[s] two proofs of the fact that stereographic projection preserves circles, one algebraic and one geometric". You should also be aware of http://www.astrolabes.org/. Finally, if you are using search engines, or even a card catalog, you'd better spell "stereographic" with an "eo". Have fun. Art Carlson
