EDIT Is it possible to have two 'blue moons' in one year?
Is it possible to have two “blue moons” in one year?
In modern folklore, a “blue moon” is said to be the second full moon in a calendar month. Because the time between one full moon and the next is close to the length of a calendar month, the only way this could happen is when the first full moon happens in the first few days of a calendar month. So a blue moon tends to occur about once every two or three years.
Now, could this happen twice in one calendar year? And the answer to that is yes. It last happened in 1999. There were two full moons in January and two full moons in March and no full moon in February. So both January and March had blue moons. The next year of double blue moons is coming up in 2018.
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