Planisphaerium

Planisphaerium

:"Planisphaerium" can also refer to an album by Wormed."

The Planisphaerium was a work by Ptolemy in which he explored the mathematics of mapping figures inscribed in the celestial sphere onto a plane by stereographic projection, a method of projection that preserves the properties of circles. The work would be instrumental in the use of plane astrolabes.

External links

* [http://www.hps.cam.ac.uk/starry/ptolaslabe.html "Ptolemy on Astrolabes"]


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