It hasn't happened since 1982.
It won't happen again until 2037.
We will be lucky if we actually get to see it, since clouds and snow tend to block our view of cool stuff above us in the sky.
The Super Blue Blood Moon is happening starting Wednesday morning.
It's a unique combo of a Blue Moon (which is when a second full moon occurs in the same month), a Supermoon (when the moon is closer to Earth than normal) and the Blood Moon, when Earth moves between the sun and moon to create a lunar eclipse.
Our last full moon was on Jan. 1, and #2 starts Tuesday night.
If the weather breaks and we get lucky, it all begins for us on the East Coast around 5:51 a.m. Wednesday. Since we are unlucky often with clouds blocking us, you can watch it at www.nasa.com with views from super-telescopes in California and Arizona, or go to www.space.com.
This is the Super Bowl of eclipses for scientists. Warning: be careful over the next couple of days, because weirdos tend to come out of the closet during such a lunar tripleheader!