using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var meLat = -33.922982;

        double meLong = 151.083853;

        var result1 = HaversineInM(meLat, meLong, -32.236457779983745, 148.69094705162837);

        var result2 = HaversineInM(meLat, meLong, -33.609020205923713, 150.77061469270831);

        Console.WriteLine(result1);

        Console.WriteLine(result2);

    }

    static double _eQuatorialEarthRadius = 6378.1370D;

    static double _d2r = (Math.PI / 180D);

​

    private static int HaversineInM(double lat1, double long1, double lat2, double long2)

    {

        return (int)(1000D * HaversineInKM(lat1, long1, lat2, long2));

    }

    private static  double HaversineInKM(double lat1, double long1, double lat2, double long2)

    {

        double dlong = (long2 - long1) * _d2r;

        double dlat = (lat2 - lat1) * _d2r;

        double a = Math.Pow(Math.Sin(dlat / 2D), 2D) + Math.Cos(lat1 * _d2r) * Math.Cos(lat2 * _d2r) * Math.Pow(Math.Sin(dlong / 2D), 2D);

        double c = 2D * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1D - a));

        double d = _eQuatorialEarthRadius * c;

        return d;

    }

}

​

​

​