See the Best Photos of Friday’s Blue Moon, From NYC to Seattle

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There’s a reason why “once in a blue moon” is a saying and Friday night proved it.

A blue moon is defined as any time there is a second full moon during a calendar month, according to NASA. While most years have 12 full moons, this year has 13.

Here are some of the best Blue Moon photos from Friday night, from Washington D.C. to Seattle:

Don’t let the name fool you, though. Blue moons are very rarely blue. Most are pale gray and white, resembling a moon on any other night.

A truly blue colored moon can occur on rare occasions, according to NASA, with most being spotted after volcanic eruptions.