public async Task <double> GetDistanceAsync(GeoPositions from, GeoPositions to)
        {
            if (from.Longitude >= -180 && to.Longitude <= 180 && from.Latitude >= -90 && to.Latitude <= 90)
            {
                const double earthRadius = 6371;
                double       d;
                try
                {
                    var φ1 = to.Latitude * Math.PI / 180;
                    var φ2 = from.Latitude * Math.PI / 180;
                    var Δλ = (to.Longitude - from.Longitude) * Math.PI / 180;

                    d = await Task.Run(() => Math.Acos(Math.Sin(φ1) * Math.Sin(φ2) + Math.Cos(φ1) * Math.Cos(φ2) * Math.Cos(Δλ)));
                }
                catch (Exception e)
                {
                    //Logging the Exception here;
                    throw;
                }

                return(earthRadius * d);
            }

            return(double.MinValue);
        }
 public static bool IsEqual(this GeoPositions to, GeoPositions from)
 {
     return(to.Latitude.Equals(from.Latitude) && to.Longitude.Equals(from.Longitude));
 }