Just when you thought Friday the 13th couldn't get any creepier.

Harvest Moon
Credit: jimkruger/Getty Images

You don't have to be an astronomer to know that a full moon happens once a month, or that a Harvest Moon—the full moon nearest the fall equinox—occurs just once a year.

But a full moon on Friday the 13th? Well that hasn't happened since October 13, 2000, and we're scheduled to experience one (and a Harvest Moon, to boot!) this week.

According to Farmers' Almanac, having a full moon occur on a Friday the 13th is a rare occurrence. The next one won't take place until August 13, 2049. If you ask us, the fact that this one also happens to be a Harvest Moon only adds to its spookiness.

Americans in the Pacific, Central, Mountain, and Alaskan time zones will reportedly be able to witness the rare full moon on Friday 13. For those living in the Eastern Time Zone, however, it won't be visible until 12:33am. on Saturday, September 14.

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If that we're enough to get you excited, Friday's moon will also be a Micromoon, which occurs when the full moon is at the point in the moon's orbit where it's at its apogee, or its greatest distance from Earth. This will cause the moon will appear 14 percent smaller to people on Earth than when it is at its closest.

Keep those eyes peels for a Harvest Micromoon y'all! They don't happen every day.