When it comes to rare lunar events, September 2016 seems to be : This Friday, September 30, a Black Moon will rise in the skies of the Western Hemisphere, a phenomenon we haven't seen since March 2014.
So what is a Black Moon exactly? It has several definitions, but in Friday's case, a Black Moon is the second new moon to occur in a single month, something that only happens roughly every 32 months, according to . (Typically, each month, we get a full moon and new moon—generally, a Blue Moon refers to when we get a second full moon in one calendar month.)
The moon itself will be pretty much invisible, since the illuminated side of the moon will be facing away from the Earth, but it will provide a great opportunity for stargazing, thanks to all that darkness.
The Black Moon, which will occur at 8:11 p.m. ET on Friday, will only be happening in the Western Hemisphere because, technically, the new moon will happen on October 1 for the Eastern Hemisphere (they'll be getting their Black Moon at the end of next month).
The next time we'll see a second new moon in a single calendar month in the Americas will be July 2019.