private double DistanceToIn(GeoCoordinates anotherLocation, double earthRadiusUnit)
        {
            double dlon = Radians(anotherLocation.Longitude - this.Longitude);
            double dlat = Radians(anotherLocation.Latitude - this.Latitude);

            var a =
                Math.Sin(dlat / 2) * Math.Sin(dlat / 2) +
                Math.Cos(Radians(this.Latitude)) * Math.Cos(Radians(anotherLocation.Latitude)) *
                Math.Sin(dlon / 2) * Math.Sin(dlon / 2)
            ;
            var c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
            var d = earthRadiusUnit * c;

            return(d);
        }
 public double DistanceToInMeters(GeoCoordinates anotherLocation)
 {
     return(DistanceToIn(anotherLocation, EarthRadiusInMeters));
 }