BuildIt.AR.WorldHelpers.Bearing C# (CSharp) Метод

        public static double Bearing(
            double lat1, double lon1,
            double lat2, double lon2)
        {
            //const double R = 6371; //earth’s radius (mean radius = 6,371km)
            var dLon = ToRad(lon2 - lon1);
            var dPhi = Math.Log(
                Math.Tan(ToRad(lat2)/2 + Math.PI/4)/Math.Tan(ToRad(lat1)/2 + Math.PI/4));
            if (Math.Abs(dLon) > Math.PI)
                dLon = dLon > 0 ? -(2*Math.PI - dLon) : (2*Math.PI + dLon);
            return Math.Atan2(dLon, dPhi);
        }