If you have clear skies tonight, take a moment to look up. There will be a super blue moon overhead, and if last night’s preview is any indication, it will be glorious.
How Rare Is the ‘Super Blue Moon’ Appearing in Skies Later This Week?
This special event is the coincidence of two uncommon moon traits: A supermoon, which occurs when the moon appears larger than usual, and a blue moon, or the second full moon in a month.
More on what and how!
Blue supermoon: what is it, when it peaks and how to see it – NPR
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J.R. Johnson 
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