Rotation is the movement of the earth on its axis.
The ancient Indian
astronomer Aryabhata
had stated that ‘the earth is round and rotates on its own axis’.
Day and Night on the Earth due to rotation.
⇒Revolution:
The movement of the earth around the sun in a fixed path or orbit is called Revolution.
The second motion of the earth around the sun in
its orbit is called revolution. It takes 365¼ days (one
year) to revolve around the sun. We consider a year as
consisting of 365 days only and ignore six hours for the sake of convenience.
Inclination of the Earth’s axis and the orbital plane.
