While “black moon” is not an official astronomical term, it accurately describes the seemingly invisible lunar event that rarely occurs.

The "black moon," a rare phenomenon that occurs during a new moon phase of the lunar cycle, will occur this weekend. But don't get your hopes up too much, scientists say, because it will be technically invisible. Here's what to know.

You won’t actually see it, but a rare black moon – this one, the second new moon in an astronomical season – will appear on Aug. 23. Weather permitting, it'll give you darker skies and extra time to stargaze and to observe the end of the Perseid meteor shower.