A rare Halloween blue moon has been thrilling skywatchers across the globe.
The last time a blue moon occurred on Halloween was in 2001, according to the Farmer's Almanac, and will not happen again until 2039.
The phenomenon happens whenever there are two full moons in the same month -- hence the saying "once in a blue moon."
As the second full moon of the month, it is classified as a blue moon. “In recent years, people have been using the name Blue moon for the second of two full moons in a single calendar month,” NASA explains on its website. “An older definition of Blue moon is that it’s the third of four full moons in a single season.”
The next full Moon is a bit special. It will occur on Monday, November 30, 2020 at 09:42 UTC, but as well as being a full Moon it will also be a “Frosty Moon” or “Beaver Moon Eclipse.”
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