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MathGroup Archive 2001

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spherical trigonometry question

  • To: mathgroup at
  • Subject: [mg31922] spherical trigonometry question
  • From: "R. van Laake" <~raymond at>
  • Date: Wed, 12 Dec 2001 04:14:03 -0500 (EST)
  • Sender: owner-wri-mathgroup at


Who can help me with the following two formulae:

I am in an airplane, my position (Latitude/Longitude) is FromLat / FromLon.
I have to go to an airport positioned ToLat / ToLon.

1: What is the distance between FromLat / FromLon and ToLat / ToLon?
2: What direction must I take?


Raymond van Laake
raymond at

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