The main question with this super blue blood moon - for most of us - is how to best see it. Individually, these phenomena happen relatively often, but all three at the same time is a “lunar trifecta.” How to see it The “blood” is due to a lunar eclipse: Since the moon will be in the Earth’s shadow, as we explained in October, it will take on a reddish tint. Hence the old-timey saying “Once in a blue moon.”
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