A rare blue moon will light up the sky on Halloween – NewsChannel 3-12 – KEYT

Spooky season is almost upon us — and this year it will be a little bit spookier.
The night sky on Halloween will be illuminated by a blue moon, the second full moon in a month. The relatively rare occurrence happens once every two and a half years on average, according to NASA’s National Space Science Data Center.
Every month has a full moon, but because the lunar cycle and the calendar year aren’t perfectly synched, about every three years we wind up with two in the same calendar month.
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