“Once in a blue moon” is a Wednesday in January.
The United States is in for a treat in the early hours of Jan. 31, as a trifecta of cosmic events starring the moon is taking place in the form of a Super Blue Blood Moon. And the farther west one goes, the better the view will be, according to the New York Times.
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Other than the West Coast itself, the mountain region will have the best possible view. Despite cloudy conditions being forecasted in the area, Idaho should still be one of the best places to watch.
What exactly is a Super Blue Blood Moon, though? It’s complicated.
The moon will go through three specific phenomena. First of all, it is a Blue Moon, meaning it will be full for the second time in a single month. It will also be a Super Moon, meaning the moon will be closer to the earth than it normally would be. Finally, it is also a Blood Moon, which is a total lunar eclipse. A lunar eclipse is when the earth blocks out light from the sun that would otherwise reflect off the moon.
This is the first time all three cosmic events have happened in the United States at the same time since 1866, according to Space.com.