Rare ‘black moon’ rises over Western Hemisphere Friday night

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

PHILADELPHIA — A rare “black moon” rises Friday night over the Western Hemisphere, but don’t expect to see it.

NASA says a black moon is the second new moon in a calendar month. A new moon is the start of the lunar cycle and the phase where the moon is impossible to see because it’s completely shrouded in darkness.

A black moon occurs about once every 32 months. Friday night’s officially takes place at 8:11 p.m. on the East Coast.

The term “black moon” contrasts with “blue moon,” which is the second full moon in a calendar month.