Once in a blue moon: It's happening in July

Keep an eye out for a blue moon this month

Save the date for July's blue moon.

Such a celestial moment is not a harvest moon, blood moon or new moon. By modern definition, a blue moon is a calendar quirk, the second full moon within a month. It signifies a rare occurrence; was a phrase crooned by Presley, Sinatra and many others; and rises every several years.

The last was in 2012, and the next is in 2018.

It takes about 29.5 days for the moon to flash another look at its fullness. For the blue version to occur, a first full moon must be at the beginning of a month, and the blue moon comes at the end. Look for July's full moons Thursday and on the 31st.

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