“A black moon (or new moon) is when the moon is basically in between the Earth and the sun, not to make an eclipse, but where we don’t see the moon,” said Noah Petro, chief of NASA’s Planetary, Geolo...

A “black moon” is set to rise Saturday, which Hunter Miller, an astronomy educator at the Adler Planetarium, said is most akin to its opposite — a “blue moon.”

The Black Moon refers to the third New Moon in an astronomical season of four New Moons, according to timeanddate.com.