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Great circle distance on a sphere

This is an online (PHP-)version of a little TCL/Tk script I slapped together during a stay in Antarctica to keep track of the line-of-sight distance to a balloon payload. For some reason I couldn't easily or quickly find something like this on the web.

So I wrote my own.

This program is about as simple as they come: you enter the longitude and latitude of two points on the planet (in degrees) and it tells you the shortest distance between them (the great circle distance) in kilometer.

  First location Second location
Longitude [-180...180]
(negative = E of Greenwich)
Latitude [-90...90]
(negative = South)

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