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Great Circle bearings betweeen Latitude/Longitude points

Having the start/end points of a great-circle, compute their bearings.

Here's how it works:
bearing difference
Because earth is (almost) a sphere, the shortest distance from, say, Spain to Japan is not a straight line, but a great-circle line, that looks like this. So a plane would start its flight at a 29° bearing in Spain but land at 150° in Japan. That's how the geometry works.

Enter either:

  • decimal latitudes/longitudes with minus sign for South and West
  • degrees minutes seconds in a format like E 32 14 9 (32°14'9" East longitude).

Point 1Point 2
Initial Bearing
Final Bearing

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