Blue Moon means if a full moon that rises twice in one month, is called Blue Moon. Due to our calendar days, sometimes the days of the month are less than the cycle of the moon, which is 29.5 days. This can cause the moon to rise twice in one month, near the first and the last days of the same month. It is said that blue moons happen every 33 months or about every 3 years.
A Blue Moon cannot happen in February because the calendar month never has enough days. Furthermore, because the time of a blue moon is not fixed in terms of calendar dates, it can jump around quite a bit. During 1993 a blue moon occurred in either in August or September. If you lived east of the line that runs through the Atlantic Ocean, the blue moon occurred in September, but west of that line it occurred in August.
Upcoming Blue Moon Dates
1999 January & March2001 October & November
2004 July
2007 May
2009 December
2012 August
2015 July
2018 January & March
2020 October
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