Description
A blue moon is special because it is the “extra” moon in a season with four full moons This usually only happens every two-and-a-half years. Since the 1940’s, the “blue moon” has also been used for the second full moon in a calendar month, which only happens every two-and-a-half years (spaceplace.nasa.gov).
“But once in a while the odd thing happens.
Once in a while the dream comes true.
And the whole pattern of life is altered,
Once in a while the moon turns bue”
–Julia Green
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