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White Plains Residents Get To See Blue Moon Friday Night

Westchester residents can see a blue moon on Friday night.
Westchester residents can see a blue moon on Friday night. Photo Credit: Flickr

WESTCHESTER COUNTY, N.Y. -- Westchester County residents will be treated to a blue moon in the night sky on Friday. 

The modern definition of a blue moon is the second full moon in a calendar month. Since the moon completes a full cycle approximately every 29.5 days, getting two full moons in a single month is somewhat rare, according to timeanddate.com.

The original definition of a blue moon was the third full moon in an astronomical season that had four. Amateur astronomer James Hugh Pruett made a miscalculation and claimed the second full moon in any month would be a blue moon by the original definition, timeanddate.com said.

This was later proven to be inaccurate, but calling the second full moon in any month a blue moon stuck. 

The next blue moon -- by the modern definition -- won't take place until Jan. 31, 2018.

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