Rare Halloween Blue Moon to Appear on October 31 After 19 Years

Chris K

Chris K

Chris K
Staff member
Jul 3, 2023
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A Blue Moon occurs when there is more than one full moon during a month. NASA says Blue Moons occur about every two and a half years. After 2020, there are Blue Moons in August 2023, May 2026, and December 2028.On an average, the Moon is full on Halloween every 19 years, a period known as the Metonic cycle.

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