Great Circle bearings betweeen Latitude/Longitude points
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Having the start/end points of a great-circle, compute their bearings.
Here's how it works:
[画像: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:
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