public void Phase_PhaseAngle_Elongation()
{
CrdsEquatorial eqSun = new CrdsEquatorial(20.6579, 8.6964);
CrdsEquatorial eqMoon = new CrdsEquatorial(134.6855, 13.7684);
const double epslion = 23.440636;
CrdsEcliptical sun = eqSun.ToEcliptical(epslion);
sun.Distance = 149971520;
CrdsEcliptical moon = eqMoon.ToEcliptical(epslion);
moon.Distance = 368410;
double psi = BasicEphem.Elongation(sun, moon);
Assert.AreEqual(110.79, psi, 1e-2);
double phaseAngle = BasicEphem.PhaseAngle(psi, sun.Distance, moon.Distance);
Assert.AreEqual(69.08, phaseAngle, 1e-2);
double phase = BasicEphem.Phase(phaseAngle);
Assert.AreEqual(0.68, phase, 1e-2);
}
/// <summary>
/// Gets difference between ecliptical longitudes of the Sun and minor body
/// </summary>
public double LongitudeDifference(SkyContext c, T body)
{
return(BasicEphem.LongitudeDifference(c.Get(SunEcliptical).Lambda, c.Get(Ecliptical, body).Lambda));
}
protected double Phase(SkyContext c, T body)
{
return(BasicEphem.Phase(c.Get(PhaseAngle, body)));
}
/// <summary>
/// Gets phase angle for the planet
/// </summary>
public double Planet_PhaseAngle(SkyContext c, int p)
{
return(BasicEphem.PhaseAngle(c.Get(Planet_Elongation, p), c.Get(Sun_Ecliptical).Distance, c.Get(Planet_DistanceFromEarth, p)));
}
/// <summary>
/// Gets phase for the planet
/// </summary>
private double Planet_Phase(SkyContext c, int p)
{
return(BasicEphem.Phase(c.Get(Planet_PhaseAngle, p)));
}
/// <summary>
/// Gets difference between planet and Sun's ecliptical longitudes
/// </summary>
public double Planet_LongitudeDifference(SkyContext c, int p)
{
return(BasicEphem.LongitudeDifference(c.Get(Sun_Ecliptical).Lambda, c.Get(Planet_Ecliptical, p).Lambda));
}
/// <summary>
/// Gets elongation angle for the planet
/// </summary>
public double Planet_Elongation(SkyContext c, int p)
{
return(BasicEphem.Elongation(c.Get(Sun_Ecliptical), c.Get(Planet_Ecliptical, p)));
}
/// <summary>
/// Gets phase of the Moon
/// </summary>
public double Phase(SkyContext c)
{
return(BasicEphem.Phase(c.Get(PhaseAngle)));
}
/// <summary>
/// Gets phase angle for the Moon
/// </summary>
private double PhaseAngle(SkyContext c)
{
return(BasicEphem.PhaseAngle(c.Get(Elongation), c.Get(SunEcliptical).Distance * 149597871.0, c.Get(Ecliptical0).Distance));
}
/// <summary>
/// Gets geocentric elongation angle of the Moon
/// </summary>
private double Elongation(SkyContext c)
{
return(BasicEphem.Elongation(c.Get(SunEcliptical), c.Get(Ecliptical0)));
}
