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By : Oneindia Video Team
Published : October 29, 2020, 05:40
Duration : 01:29

Blue Moon on October 31: Why is it called so?

31st October, 2020, will witness a rare blue moon event. When 2 full moons fall in the same calendar month, the second full moon is called a blue moon. Since this is a rare occurence, the phrase once in a blue moon describes an event or phenomenon that happens after long gaps in time.
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