private const double EARTH_RADIUS = 6378.137;//地球半径
private float CalcDistance(CityInfo m, Com.Aurora.AuWeather.Models.Location location)
{
var lat1 = Tools.DegreesToRadians(m.Location.Latitude);
var lat2 = Tools.DegreesToRadians(location.Latitude);
var a = lat1 - lat2;
var b = Tools.DegreesToRadians(m.Location.Longitude) - Tools.DegreesToRadians(location.Longitude);
var s = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) +
Math.Cos(lat1) * Math.Cos(lat2) * Math.Pow(Math.Sin(b / 2), 2)));
s *= EARTH_RADIUS;
return((float)Math.Round(s * 10000) / 10000f);
}
public static TimeSpan GetSet(Location geoPoint, DateTime desiredTime)
{
double sunset, glong, glat;
int year, month, date;
year = desiredTime.Year;
month = desiredTime.Month;
date = desiredTime.Day;
glong = geoPoint.Longitude;
glat = geoPoint.Latitude;
sunset = result_set(UT_set(UTo,
GHA(UTo, G_sun(t_century(days(year, month, date), UTo)),
ecliptic_longitude(L_sun(t_century(days(year, month, date), UTo)),
G_sun(t_century(days(year, month, date), UTo)))),
glong,
e(h, glat, sun_deviation(earth_tilt(t_century(days(year, month, date), UTo)),
ecliptic_longitude(L_sun(t_century(days(year, month, date), UTo)),
G_sun(t_century(days(year, month, date), UTo)))))), UTo, glong, glat, year, month, date);
return new TimeSpan((int)(sunset / 15 + (DateTime.Now - DateTime.UtcNow).Hours), (int)(60 * (sunset / 15 + (DateTime.Now - DateTime.UtcNow).Hours - (int)(sunset / 15 + (DateTime.Now - DateTime.UtcNow).Hours))) - 1, 0);
}
