(CNN) – For the first time in three years, a Black Moon will occur in North America on Wednesday.
A Black Moon is the second New Moon of the month.
It works similarly to a leap year.
A lunar cycle typically takes about 29 days to complete but our months are slightly longer.
So sometimes, about every 32 months, we happen to get two Full Moons or two New Moons.
The second Full Moon is called a Blue Moon, and the second New Moon is called a Black Moon.
So what will you see Wednesday night?
You probably won’t see anything.
A Black Moon is really just a New Moon.
The only real significance is that it’s the second one so you won’t see it, since it will blend in with the sky.
(This story was originally published on July 31, 2019)