Motions of the Earth-1

1. The earth rotates on its axis from west to east.

2. The axis is an imaginary line which passes through its centre

3. Axis is inclined at an angle of 66½° with the plane of the earths orbit

4. Inclination is always towards pole star

5. Due to the spherical shape of the earth, only half of it gets light from the sun at a time

6. The portion facing the sun experiences day while the other half away from the sun experiences night.

7. The circle that divides the day from night on the globe is called the circle of illumination

8. The earth takes about 24 hours to complete one rotation around its axis.

9. The period of rotation is known as the earth-day.

10. Days and nights are caused due to rotation

11. It causes the bulging of the earth at the equator flattening at the poles