Length of day
time taken for the Earth to make one complete revolution upon its axis, relative to a given geographical location From Wikipedia, the free encyclopedia
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The length of the day is how long a day is. On Earth, a sidereal day is 23 hours and 56 minutes long, and a solar day is 24 hours. There are other planets with different types of day.
Length of the day on other planets
This uses Hours time and days on earth.[1]
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). This is adjusted by leap seconds.
A century ago, the average day was about 1.7 milliseconds shorter than today.[2] In the late Neoproterozoic about 620 million years ago a day had only about 21.9±0.4 hours.[3]
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