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Once in a Blue Moon


Blue moons between 2009 and 2016
The following blue moons will occur between 2009 and 2016. These dates use UTC as the timezone; months will vary with different timezones.

Seasonal; Using the Farmers' Almanac definition of blue moon (meaning the third full moon in a season of four full moons), blue moons occur:

November 21, 2010
August 21, 2013
May 21, 2016

Calendar; Two full moons in one month:

2009: December 2; December 31 (combined with a partial lunar eclipse in some parts of the world)
2012: August 2, August 31
2015: July 2, July 31

Note that, unlike the astronomical seasonal definition, these dates are dependent on the Gregorian calendar and time zones. The full moon at 2009-12-31 19:13 UTC occurs early the next day in eastern countries (Australia and most of Asia), where the calendar blue moon will not occur until late January 2010.
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