"This month's full moon, which rises on Tuesday (Aug. 20), is not just a Blue Moon - it's also the Full Sturgeon Moon, the Full Red Moon, the Green Corn Moon and the Grain Moon."
"Today's full moon qualifies as a Blue Moon because it's the third full moon in a season with four (most seasons have only three). Historically there have been two different definitions of a Blue Moon."
"Technically, a Blue Moon is the third full moon in a four-full-moon season. However, a 1946 article in 'Sky & Telescope' magazine mistakenly defined it as the second full moon in a single month (since most months have only one full moon), and the definition stuck. Because August will have just this one full moon, it wouldn't meet the mistaken, though commonly used, definition, though it does qualigy as a technical Blue Moon."
Huh, who knew? I guess you learn something new every day. (I like the mistaken definition best, though.)
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