The Dark Moon also called Lilith is astronomically the three days before the New Moon appears. The Moon, of course, cycles around us and appears with different "faces", the full Moon, half Moon, quarter Moons. A new Moon is when it lies directly in the path between Earth and Sun, and appears to us to be in conjunction with the Sun. However, the three days before the Moon goes "new" every month it disappears totally from our view. To the ancients, it was a dark, mysterious time. Unfortunately, over the years as we moved from matriarchal religions to more male dominated religions, the dark and mysterious Moon has become demonized. It became the symbol of the "bad girl" and the baddest of them all is Lilith.
First mentioned in Sumerian mythology about 3000 years ago, Lilith was seen in Hebrew stories as the first wife of Adam. She was not too happy with the plan that she should submit to Adam and be that happy helper stuff that Eve fell for so she said "bye bye Adam" and went off to make her own way in the world. So forevermore, she was called the bad girl - the fallen woman - of the Hebrew Bible. Because the Moon has always been associated with the feminine the dark Moon, the time of mystery and secrecy eventually bore the name of Lilith.
Astrologically, the time of the dark Moon is the time when we should get in touch with the hidden side, with the side we hide from society because it is not acceptable. This is the time we need to assess why we keep the side hidden and why we dance to the rules of society.
Where Lilith is on your astrological chart indicates the area where we will often have a spiritual crises because we are hiding a part of our true self so as not to risk disapproval. Is it in Aries? Well, where is your fear of charting new courses? Gemini? Well, always seeking the unusual in travel is fun but are you running away from something? Scorpio Lilith brings passion and pushes us to be free of sexual inhibitions.
So use those dark days to see what you have kept hidden from yourself for fear of repercussions and assess if that is still working for you.