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 = LunarEphem.Elongation(sun, moon);
Assert.AreEqual(110.79, psi, 1e-2);
double phaseAngle = LunarEphem.PhaseAngle(psi, sun.Distance, moon.Distance);
Assert.AreEqual(69.08, phaseAngle, 1e-2);
double phase = LunarEphem.Phase(phaseAngle);
Assert.AreEqual(0.68, phase, 1e-2);
}