Distance and azimuth between two cities Calculator

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Calculates the distance and azimuth between two cities.

Calculation assumes that the Earth is a sphere with a radius of 6378km.
Input negative degree for west longtitude and south latitude.
Distance and azimuth between two cities
city A:
    1.  
    1. Longitude
    3. ,
    5. Latitude
    1.  
city B:
    1.  
    1. Longitude
    3. ,
    5. Latitude
    1. [ Earth's radius r
    3. km
    4. ]
Compass from A to B

place A(x1, y1)、place B(x2, y2)

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