BELIEVE   ME   NOT!    - -     A   SKEPTIC's   GUIDE  

. . . "isotropic."18.1
Note how our terminology of spherical coordinates stems from terrestrial navigation (Tropics of Cancer, Capricorn, etc.). Since the 16$^{\rm th}$ Century, our most familiar spherical object (next to the cannonball) has been the Earth.
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Jess H. Brewer
2000-02-22