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Normally there are 3 full moons every quarter year, one per month. But there is about an 11 day difference between a 12 full moon, or new moon, lunar year and a 12 month Earth solar year. These days add up until it results in a month with 2 full moons. One at the beginning of the month and 1 at the end of the month.

This can also result in a very rare 2 blue moon year. The calculation depends on where you live. So while N. America will have only 1 blue moon in Jan. 2010, Australia will see blue moons in both January and March. The reverse happened in 1999.

A blue moon happens about every 2.5 years and a double blue moon occurs about 5 times in a century.

The term "blue moon" means an extra full moon but we can have, and have had, blue colored moons. Generally this is a result of airborne particles like volcanic ash or smoke.

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15y ago

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