It’s the first time since 1977 that a full moon has coincided with the holiday, and it won’t be back until 2034, according to Washington State University.

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Those keeping an eye out for Santa’s sleigh on Christmas Eve are likely to catch sight of another rare Christmas spectacle — a full moon.

It’s the first time since 1977 that a full moon has coincided with the holiday, and it won’t be back until 2034, according to a news release from Washington State University.

The National Weather Service is calling for rain in the Puget Sound area Thursday — and with it, heavy cloud cover. But by early Christmas Day, there may be enough clearing to see the moon.

East of the mountains, snow cover should reflect back the moonlight, adding to the Christmas glow.

“It should make for impressive viewing,” said Guy Worthey, an associate professor of physics and astronomy at WSU. “It will track high in the sky and be out all night.”