Calculates the Moon's mean perigee (mean Lilith / Black Moon).
Julian centuries from J2000.0
Longitude of mean perigee in degrees
The lunar apogee (mean Black Moon Lilith) is 180° from the perigee. The perigee advances through the zodiac, completing one cycle in about 8.85 years.
Meeus, "Astronomical Algorithms", Chapter 50
Calculates the Moon's mean perigee (mean Lilith / Black Moon).