This hasn't occurred for nearly 70 years.

Rosalie Chan / Time.com
June 20, 2016

This article originally appeared on time.com.

For the first time in nearly 70 years, a full moon will rise on the same day as the summer solstice.

Space broadcaster Slooh will stream this phenomenon live from its observatory at the Institute of Astrophysics in the Canary Islands on Monday at 8 p.m. ET. Slooh host Paul Cox and Slooh astronomer Bob Berman will discuss the rare astronomical event during the broadcast.

Related: When Is the Summer Solstice?

“Having a full moon land smack on the solstice is a truly rare event,” Berman said in a statement. “We probably won’t push people off pyramids like the Mayans did, but Slooh will very much celebrate this extraordinary day of light with fascinating factoids and amazing live telescope feeds.”

Related: Why We Celebrate the Winter Solstice

This event is mathematically predicted to happen every 15 years, but it has not happened since 1948, when Harry S. Truman was president. The hosts of the broadcast will discuss why this is the case.

Jane Stillman, editor of The Old Farmer’s Almanac, and astrophotographer Robert Reeves will join in the livestream.

If viewers have questions, they can tweet @Slooh or use the chat room on Slooh.com.

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