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 Lilith Astrology, in astrology incorporates three entities. We have Black Moon Lilith, Asteroid Lilith and the lesser known Dark Moon Lilith. Together they work as a Triple Moon Goddess, which describes a process of transformation.