Anyone with an orrey will see the two biggest Planets in our solar system as close as they have seemed in Decemeber, "Jupiter and Saturn will appear closer in Earth's night sky than they have since 1226 A.D."; only about 1 degree apart for us looking up. OK, the close alignment of these two planets happens every 20 years or so.* "But it's not always in December and it's been nearly 800 years—we're talking Middle Ages—since they got this close. 

"Technically, the two largest planets in our solar system will still be hundreds of millions of miles apart. But Dec. 21, from our vantage point, they'll look like they're nearly touching, creating a radiant point of light that's being dubbed the Christmas Star, or Star of Bethlehem, for obvious reasons."

"The lousiest year in living memory will end with an offering of heavenly wonder: a Christmas Star."

Also, it is the winter solstice so I suppose of course this alignment could be a brighter Saturnalia than usual if that's your thing (plenty of Romans about!) or shining for Juul (even more pagans!) etc...

* ...actually 19.86 years for the average frequency of a great conjunction so the last one was on 10.2.01 and today is 21.12.20...ooooh.