Black Moon or Lilith is part of Astro-psychology :it is the moonspot in your radix which is most distance from the earth. It means you can not wear any mask or find ways of protection , -also subconcious levels ,you are completely 'naked' there, so most vulnerable. (How to Find All the Lilith's(= Black moon) in Your Birth Chart AstroFix)
Lilith Astrology - Lunar Apogee, Asteroid & Ghost. Oh Lilith, why are you whispering forgotten words to me? Am I a sacrifice or I sacrificed you? In between shining Sun luminous Moon, you have been waiting for me for a long, long time, may be too long.