Planets Rotation and Day Length


Why after all do we have 24 hour days.

When talking about planets� rotation, we first need to know what sidereal period and synodic period rotation are. Sidereal period rotation is the rotation time for the planet, which is the time it takes for the stars to rotate one path. Synodic period rotation is the length of the day, which is the time that the sun takes to make one rotation on the sky. There are two types of planet rotation, which are direct or retrograde. Direct rotation rotates around the same direction as its orbital motion, and retrograde rotation rotates the opposite direction as its orbital motion. Planets rotate while moving around the sun, which changes the position of the sun.

Let�s go back to sidereal and synodic period and compare those periods to each different planets. Mercury takes 58.6467 days in Sidereal Period and 175.940 days for Synodic Period. Venus takes - 243.02 days in Sidereal Period and - 116.75 days for Synodic Period. Earth takes 23 hr 56 min 4.1 sec in Sidereal Period and 24 hr 0 min 0 sec for Synodic Period. Moon takes 27.322 days in Sidereal Period and 29.53 days for Synodic Period. Mars takes 24 hr 37 min 22.66 sec in Sidereal Period and 24 hr 39 min 35.24 sec for Synodic Period. Jupitor takes 9 hr 55 min 30 sec for both Sidereal and Synodic Period. Saturn takes 10 hr 32 min 35 sec for both Sidereal and Synodic Period. Uranus takes - 17 hr 14 min 24 sec for both Sidereal and Synodic Period. Neptune takes 16 hr 6.6 min for both Sidereal and Synodic Period. Most of the planets orbit around the Sun in eastward direction. However, Venus and Uranus rotate in the opposite direction and therefore give negative periods.





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