The “black moon,” a rare phenomenon that occurs during a new moon phase of the lunar cycle, will occur this weekend. This is called the new moon phase of the lunar cycle — when the moon isn’t visible at night. A new moon is considered by some to be a black moon one of two ways. When there are four new moons in one season, the third new moon is called a “black moon.”Saturday’s black moon is the third new moon of the summer season. You won’t see itYou won’t be able to see the black moon, but it will still be there in the sky.