Once In A Blue Moon Happens This Saturday; May 21 Represents Seasonal Occurrence

Perhaps everyone has heard the phrase "once in a Blue Moon".  In the popular lexicon, the phrase has come to mean something that doesn't happen often.  Most people also know what a Blue Moon is astrologically speaking:  the second full moon in a calendar month.  This Saturday however, the Blue Moon that occurs is the only full moon we'll see in May.  So why is May 21, 2016 considered a Blue Moon?

The answer comes from the second definition of the phenomenon.  While it's true that a Blue Moon occurs when there is a second full moon in a month it can also occur when there are four full moons in a season.  When this happens, the third full moon is called a Blue Moon - even if it's the only occurrence in the calendar month.

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