There are a few different definitions. A Black Moon is typically said to be when there’s more than one New Moon in the same calendar month. That can occur because the Moon takes 29.5 days to orbit Earth, which is roughly the length of a month—a moonth.
Regarding this, what does the Moon symbolize spiritually?
The Moon represents powerful feminine energy. It signifies wisdom, intuition, birth, death, reincarnation, and a spiritual connection. Moon cycles are similar to the cycle of a seed: the seed grows into a flower, then blooms, and then dies.