"Blue moon" is not really blue
Get ready for some extra special sparkle on New Year’s Eve when the second full moon of December – which makes it a blue moon – shines over your festivities on Thursday.
To be called a “blue moon,” the moon must be full for the second time in a calendar month, which will occur on Thursday, Dec. 31 – New Year’s Eve – for the first time in almost 20 years.
A blue moon occurs every two and half years, but the last time there was a blue moon on New Year’s Eve was in 1990 – and the next will be in 2028.
Although the moon will not appear to be blue, the modern definition a blue moon is relatively new, and began in the 1940s, according to NASA.
To explain blue moons to the masses, Sky & Telescope magazine published an article in 1946 entitled “Once in a Blue Moon,” where the author James Hugh Pruett cited the 1937 Maine almanac and opined that the "second [full moon] in a month, so I interpret it, is called Blue Moon."
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