It's called the "Great Conjunction," or the moment when Jupiter and Saturn appear at their closest – "a tenth of a degree apart" – according to Chicago's Adler Planetarium.

The event has been dubbed the "Christmas star," because some astronomers have theorized the “Star of Bethlehem” could have been a rare conjunction involving both Jupiter and Saturn.


https://www.nbcchicago.com/news/local/christmas-star-to-be-visible-for-first-time-in-nearly-800-years-this-month/2388427/

Is that the star that Clark Griswold mentions during the Christmas dinner scene in National Lampoon's Christmas Vacation but his uncle told him it was really the sewer explosion? I never knew that The Christmas Star really did exist and I thought it was just fictional in the movie
Bestie