Earth's Rotation


How fast does the earth actually rotate.

The Earth rotates around its axis, which is an imaginary line that has the center point for gravity. It goes through the north and the south poles and spins around them. Earth does not spin straight up and down but it is actually tilted. It is tilted perpendicularly about 23.5 degrees, which is inclined 66.5 degrees from the Earth’s orbital plane. Therefore, the Earth rotates toward the east side in counter clockwise direction. Earth takes 23 hr 56 min 4.1 sec in Sidereal Period, which is the rotation time for the Earth and 24 hr 0 min 0 sec for Synodic Period, which is the time that the sun takes to make one rotation on the sky. Our clock time is based on the Earth’s rotation to the sun.

There are three different types of days related to the Earth’s rotation. True solar day is the Earth’s rotation period relative to the sun. It is longer than the regular solar day and is dependent on the Earth’s orbital motion. Mean solar day is the average of the true solar day over an entire year, which contains about 86,400 mean solar seconds. Last one is the stellar day, which is relative to the fixed stars. It is 86,164.098 903 691 mean solar seconds and is shorter than the mean solar day. The velocity of Earth’s rotation effects lot of features in the Earth. It effects Earth’s climate, ocean current, Earth’s shape and many more.




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