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Old 31st Aug 2000, 23:22
  #10 (permalink)  
Jetlagged
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Hi Ceppo,
here's an equation that I found for GCD between two points on a sphere.
GCD={ACOS([SIN latone*SIN lattwo]+[COS latone*COS lattwo*COS(longone-longtwo)])}*59.99985

Later
Bye