What a Blue Moon Is

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Blue Moon

Since there are times when there will not be a full moon during a month, you will find that there may be two full moons in the month after. When there are two full moons in a single month, it is known as a blue moon. Of course, the moon does not actually turn blue during these times. The first full moon of the month is just known as a full moon, but the second full moon that occurs during the same month is called a blue moon. Since it does not happen often, this is where we get the expression once in a blue moon.