Calculates the Moon's longitude of the ascending node (mean node).
Julian centuries from J2000.0
Longitude of ascending node in degrees
The ascending node is where the Moon's orbit crosses the ecliptic going north. This is the "mean" node - it doesn't include short-period oscillations.
The node regresses (moves backward) through the zodiac, completing one cycle in about 18.6 years (~19°/year or ~1.5°/month).
Meeus, "Astronomical Algorithms", Eq. 47.7, p. 343
Calculates the Moon's longitude of the ascending node (mean node).