Rare blue moon to ring in the New Year

Question: how often does as blue moon happen on New Year’s Eve?

Answer: once in a blue moon.

According to popular definition, a blue moon is the second full moon in a month. But don't expect it to be blue — the name has nothing to do with the color of our closest celestial neighbor.

A full moon occurs every 29.5 days, and most years have 12. On average, an extra full moon in a month — a blue moon — occurs every 2.5 years. The last time there was a lunar double take was in May 2007. New Year's Eve blue moons are rarer, occurring every 19 years.

The last time was in 1990; the next one won't come again until 2028.

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