Triple Conjunction of Mars, Jupiter, and Saturn
When two or more planets align in the night sky, it’s called a triple conjunction. What matters most is the line of sight, because Saturn, Jupiter, and Mercury take a different amount of time to orbit the sun. According to Travel and Leisure, “Distant Saturn takes 29 years, Jupiter 12 years, and tiny Mercury just 88 days. Since Mercury is the first planet from the sun and we’re on the third planet, it’s an inner planet to us. So, just like Venus, Mercury always appears to be relatively close to the sun.”
The last triple conjunction occurred in 2021. To spot it, you needed to be low on the west-southwest horizon, and in a place with no cloud cover. The best time to have seen it was right after sunset. The next one won’t occur until 2148-2149 (Travel and Leisure).