///Returns whether o has a descending node with the equator. This can be false
///if o is hyperbolic and the would-be descending node is within the opening
///angle of the hyperbola.
internal static bool DescendingNodeEquatorialExists(this Orbit o)
{
return(Math.Abs(MuUtils.ClampDegrees180(o.DescendingNodeEquatorialTrueAnomaly())) <= o.MaximumTrueAnomaly());
}
///Returns whether a has a descending node with b. This can be false
///if a is hyperbolic and the would-be descending node is within the opening
///angle of the hyperbola.
internal static bool DescendingNodeExists(this Orbit a, Orbit b)
{
return(Math.Abs(MuUtils.ClampDegrees180(a.DescendingNodeTrueAnomaly(b))) <= a.MaximumTrueAnomaly());
}