Great conjunction - Wikipedia
https://en.wikipedia.org/wiki/Great_conjunctionA great conjunction is a conjunction of the planets Jupiter and Saturn, when the two planets appear closest together in the sky. Great conjunctions occur approximately every 20 years when Jupiter "overtakes" Saturn in its orbit. They are named "great" for being by far the rarest of the conjunctions between naked-eye planets (i.e. excluding Uranus and Neptune).
The ‘Great’ Conjunction of Jupiter and Saturn | NASA
https://www.nasa.gov/feature/the-great-conjunction-of-jupiter-and-saturn15.12.2020 · Saturn, top, and Jupiter, below, are seen after sunset from Shenandoah National Park, Sunday, Dec. 13, 2020, in Luray, Virginia. The two planets are drawing closer to each other in the sky as they head towards a “great conjunction” on December 21, where the two giant planets will appear a tenth of a degree apart. Credits: NASA/ Bill Ingalls.