/// <summary>
/// Calculates sidereal time at Greenwich.
/// Based on Chapter 11 of Astronomical Algorithms.
/// </summary>
/// <param name="date">Julian Ephemeris Day</param>
/// <returns>Sidereal time in degrees.</returns>
public void SetSiderealTime(double date)
{
double t;
//date = 2446896.30625;
//jd = date;
t = (date - GPAstroEngine.J2000) / 36525.0;
GPAstroEngine.calc_epsilon_phi(date, out delta_phi, out epsilon);
// 11.2
mean_sidereal_time = GPMath.putIn360(280.46061837 + 360.98564736629 * (date - GPAstroEngine.J2000) +
t * t * (0.000387933 - t / 38710000));
apparent_sidereal_time = GPMath.putIn360(mean_sidereal_time + delta_phi * GPMath.cosDeg(epsilon));
}
public static void calc_epsilon_phi(double date, out double delta_phi, out double epsilon)
{
GPAstroEngine.calc_epsilon_phi(date, out delta_phi, out epsilon);
}
