Blue moon, men and women in blue, will greet holiday revelers
A blue moon will reign over tonight's New Year's festivities.
The celestial rarity occurs when a second full moon beams during the month. And since full moons only occur every 29.5 days, blue moons generally happen during months with 31 days.
Blue moons in a 30-day month occur every 2 to 3 years, NASA says.
Nobody's really sure how the moniker "blue moon" came about; it's been around for centuries; but you could Google it from your bar stool to learn about it.
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