Returns the spherical angle in degrees for an equilateral triangle of known side length
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SphericalAngleForEquilateralTriangleFromGreatCircleSideLength( side_length, EarthRad = 6367.4447 )
The great circle distance of a side of the triangle in kilometres.
Radius of the Earth in kilometres.
Spherical angle in degrees.
Graeme T. Lloyd email@example.com
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