//return Sine of the altitude
//mJD0h - is Modified Julian Date on 00:00
//hour - is adding hour to 00:00
private double SinAlt(double mJD0h, double hour, double latitude, double longitude)
{
double MJD, T, RA, Declination, tau;
MJD = mJD0h + hour / 24.0;
T = (MJD - 51544.5) / 36525.0;
var v = GetSunCoor(T);
EclipLon = EclipLon == -1 ? v.X : EclipLon;
v = Astro.ToEquatorial(v);
RA = v.X;
Declination = v.Y;
tau = Astro.GMST(MJD) + Astro.Rad(longitude) - RA;
return(Math.Sin(Astro.Rad(latitude)) * Math.Sin(Declination) + Math.Cos(Astro.Rad(latitude)) * Math.Cos(Declination) * Math.Cos(tau));
}