Approximately how long is a year on Uranus?

The story behind the answer

Uranus takes about 84 Earth years to orbit the Sun. That long “year” follows from Kepler’s third law: orbital period grows with distance. Uranus orbits roughly 19 times farther from the Sun than Earth (about 19 AU), and T ≈ √(19³) ≈ 84 years.

Its extreme axial tilt—about 98 degrees—adds a wild twist: Uranus essentially rolls around the Sun, giving each pole about 42 years of continuous daylight followed by 42 years of darkness. Memory tip: think “84-year year” split into four mega-seasons of roughly 21 years each.