Halloween night will feel extra spooky this year as a rare lunar event is set to light up the night sky — and it only happens “once in a blue moon”.

According to the Farmers’ Almanac, a full moon will appear on Oct. 31, 2020. Such an event occurring on Halloween only happens every 18 to 19 years, so it will be an extra-special spectacle, according to the periodical.

“In 2001, ghosts and goblins in Central and Pacific time zones trick-or-treated by the light of a full Moon, but a Halloween full Moon hadn’t appeared for everyone in all time zones since 1944!” the Farmers’ Almanac said.

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Since it will be the second full moon of the month, it is called a “blue moon.” It won’t appear blue in color, though. This name is given to the second full moon to appear in a calendar month, according to the Farmers’ Almanac.

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