SAN FRANCISCO (KGO) — The skies gave us the perfect spooky setting for Halloween night known as the Blue Moon.

The phenomenon happens whenever there are two full moons in the same month — hence the saying “once in a blue moon.”

RELATED: Look out for Halloween full moon to light up the sky tonight

The last full moon was October 1 – setting us up for this rare event.

The last blue moon on Halloween was in 1944.

Check out the time-lapse video in the media player above

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