Longest period of daylight/darkness on any planet in the Solar System
- Who
- Uranus
- What
- 42 year(s)
- Where
- Not Applicable
- When
- 25 October 2017
Because of the extreme axial tilt of Uranus, its polar regions take turns pointing almost directly at the Sun. Over the course of Uranus’ 84-year-long orbit of the Sun, this means each pole takes turns in receiving 42 years of non-stop sunlight, followed by 42 years of non-stop darkness.