DAY DURATION
04/17/2026 |
The Friday File: On Earth, a sidereal day, one full spin relative to the stars, lasts 23h 56m. Mercury rotates in 58d 16h; Venus takes 243d (and spins backward). Mars: 24h 37m. Jupiter spins in 9h 55m, Saturn in 10h 33m. Uranus takes 17h 14m, Neptune ~16h, and Pluto 6d 9h. From whiplash-fast to glacial slow, the solar system keeps very different time.Â