Spooky season is almost upon us -- and this year it will be a little bit spookier with a rare blue moon.
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.
It's also the first time a Halloween full moon has appeared for all time zones since 1944, according to Farmers' Almanac. The last time a Halloween full moon appeared was for the Central and Pacific time zones in 2001.Read MoreThe"once in a blue moon" phenomenon does not necessarily mean the moon will look blue on Halloween. While the dark blue tone of an evening sky can affect the coloring we see, Earth's satellite will most likely not appear blue at all.
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