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What is a blue moon?
By Renee Duff, AccuWeather.com Meteorologist
May 21, 2016; 9:06 PM ET
While the phrase 'once in a blue moon' is well-known, many may not realize the true definition of an astronomical blue moon.
"The second full moon in a given calendar month is coined a ‘blue moon,'" AccuWeather Meteorologist Brian Lada explained.
Blue moons typically occur once every few years.
Lada added that a second, lesser known definition of a blue moon is the third of four full moons that occurs during a single astronomical season.
According to EarthSky, blue moons under the second definition are rare, which is how the term ‘once in a blue moon' originally came about.
Despite its name, a blue moon is rarely the color blue.[more]
What is a blue moon?
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