Saturday's new moon is a seasonal "black moon" — a rare phenomenon that occurs once every 33 months. Here's what that means and why it's a great night for stargazing.

Just when you thought things couldn’t get any weirder, a rare black moon is set to rise this weekend. It’s expected in the early hours of Saturday morning, at around 2:06 a.m. EDT, according to the U.S. Naval Observatory. But you don’t need to wake up at 2 a.m. to catch it.