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Length of day
Length of the day on other planets
This uses Earth time.
- Mercury - about 59 days
- Venus - 243 days
- Earth - 1 day
- Mars - about 1 day, 0.6 hours
- Jupiter - 9 hours
- Saturn - about 10 hours
- Uranus - about 13 hours
- Neptune - about 15 hours
Increasing day length on Earth
The Earth is constantly losing angular velocity and rotational energy through a process called tidal acceleration, which leads to a slow lengthening of the day. Tidal acceleration is an effect of the tidal forces between an orbiting natural satellite (e.g. the Moon), and the primary planet that it orbits (e.g. Earth).
- Enchanted Learning.com 
- McCarthy D.D. & Seidelmann P.K. 2009. Time: from Earth rotation to atomic physics. Weinheim: Wiley-VCH, pp. 88–89
- Williams, George E. (2000). "Geological constraints on the Precambrian history of Earth's rotation and the Moon's orbit". Reviews of Geophysics 38 (1): 37–60. .