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When earth spins or rotates around its axis, that movement of spinning is called Rotation of Earth. And when earth spins or revolves around the sun, that movement is called Revolution of Earth. In this chapter, we will talk about the motions that our planet Earth has.
The Earth has a circumference (distance around at the Equator) of approximately 40,075 km (24,901 mi) The Earth rotates on its axis relative to the Sun in one "mean solar day". It rotates exactly 360° in one "Mean Sidereal Day" which is 86,164.0909 seconds, or 23 hrs 56 min 4.0909 seconds.
Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space. Earth rotates eastward, in prograde motion. As viewed from the northern polar star Polaris, Earth turns counterclockwise .
There are also other movements that are important and not as well known as it is the nutation and precession movement. In this article we are going to talk about the four movements that our planet has around the Sun and the importance of each one of them.
Imagine a line passing through the center of Earth that goes through both the North Pole and the South Pole. This imaginary line is called an axis. Earth spins around its axis, just as a top spins around its spindle. This spinning movement is called Earth’s rotation.
NARRATOR: Earth experiences two different motions, rotation and revolution. Earth spins on its axis, and it takes one day to do so. In one day Earth makes one rotation on its axis. Earth also travels on an elliptical orbit around the Sun. And it takes one year to make a complete trip.
Imagine a line passing through the center of Earth that goes through both the North Pole and the South Pole. This imaginary line is called an axis. Earth spins around its axis, just as a top spins around its spindle. This spinning movement is called Earth’s rotation.
