The movement of the earth around the sun is called the revolution of the earth. Because there are other celestial bodies in the solar system that revolve around the sun with the earth, the sun is the central celestial body they have, so it is called "public" rotation. The direction of the earth's revolution is from west to east, and the revolution time is one year.

The phenomena produced by the earth's rotation:

1, the change of the length of day and night.

2. Changes in four seasons: spring, summer, autumn and winter.

3. The change of solar altitude angle at noon.

4. Division of five zones (tropical zone, north-south temperate zone and north-south frigid zone).