On December 21st, you can see a conjunction between Saturn and Jupiter in the southwest night sky, just after sunset. This is the first time these 2 planets have been this close in over 800 years in the nighttime sky. It's thought that a similar conjunction between the 2 planets is what the Magi followed when they went in search of Jesus.
And, if you think you can miss this and catch it next time, think again, another conjunction (and not as close as this one) won't occur until 2080.
Jupiter and Saturn will form rare "Christmas Star" on winter solstice
On December 21, Jupiter and Saturn will appear closer in Earth’s night sky than they have since 1226 A.D. You can watch the event live here, courtesy of Lowell Observatory.
astronomy.com
And, if you think you can miss this and catch it next time, think again, another conjunction (and not as close as this one) won't occur until 2080.