Roughly every twenty years, the paths of Jupiter and Saturn line up in the night sky, and the planets appear close together, an event called the Grand Conjunction. One occurs this evening. Look toward the southwest just after sunset, and if the sky is clear, you’ll see Jupiter and Saturn almost perfectly aligned, only about 0.1 degree apart. They haven’t come this close since 1623, but they were nearly aligned with the Sun and hard to see that year. The last time they were this close and relatively far from the Sun was in 1226.Grand Conjunctions occurred three times in 7 BC and again as a triple conjunction with Jupiter, Saturn, and Mars in early 6 BC. You can find more about those conjunctions and the Star of Bethlehem here.