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 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 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));
}