Formula for Distance Calculation
Let me know your formula for distance calculation
or any organization opening its formula for public.
We use an approximation method in Japan.
The formula is as follows:
D = square root ( AaAa + BbBb - AaBbBbc )
starting point: n1, e1
loft location: n2, e2
A: n1-n2 a: 111.323
B: e1-e2 b: 111.323 * cos(n2)
c: tan(n2)/6378.388
Thank you for your cooperation.