A Rare Black Moon Will Rise In the Sky on Friday Night

Get ready for some excellent stargazing.

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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.)

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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.

(h/t )

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