A supermoon occurs only three or four times a year when the moon reaches its closest point to Earth, appearing up to 14% larger and a third brighter.
Tonight's blue supermoon is extremely rare, coinciding with the first blue moon since August last year and appearing dark red due to wildfire ash.
A blue moon happens once every two or three years, defined as either the second full moon in a month or the third in a season with four.
The moon will be 14,300 miles closer than normal tonight, making it appear larger and brighter, but it will look red because of upper atmosphere ash.
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