A rare Black Moon is coming September 30th
A rare Black Moon will emerge in the Western Hemisphere on September 30th -- but you won't be able to see it.
That's because the side of the moon lit by the sun faces away from Earth.
SEE ALSO: This private company is launching a mission to land a rover on the moon
A Black Moon is the second new moon of a month and a social phenomenon used to describe months with no full moons.
Ian O'Neill a Space Producer for Discover News says, "Social media has a huge part to play. These things go viral."
The term Black Moon isn't even recognized by NASA.
Click through the gallery to see previous Black Moons:
Another type of Black Moon is when no new moons occur in a month. These happen every five to ten years in February.
While the lunar event doesn't occur once in a blue moon. It does happen about every two years.
The next Black Moon is expected in July 2019.