A black moon is basically the second new moon of the month, something that rarely occurs. 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 in a month is called a blue moon, and the second new moon is called a black moon. But a black moon also refers to a month where there are no new moons — which is only possible in February...