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Sky & Telescope Magazine

Sky & Telescope Magazine

Dan Kitwood, Getty Images
Dan Kitwood, Getty Images

Why is The Full Moon Called a ‘Blue Moon’ when it Isn’t Blue?

Have you taken the time to look at that great big "Blue Moon" each evening rising in the eastern sky the past two days? By definition a "Blue" moon is the term for a second full moon within one calendar month. With the first full moon of this month occurring on July 1 and this one on the 31st, it qualifies as a "Blue" moon.  

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