# NCERT Class 6 Geography Chapter 3 Notes Motions of the Earth

### CBSE Class 6 Geography Chapter 3 Notes Understanding The Lesson

1. The Earth has two types of motions. These are Rotation and Revolution.

2. Rotation is the movement of the Earth on its axis. The Earth takes about 24 hours to complete one rotation around its axis.

3. Due to the rotation of axis, day and night are formed.

4. Axis makes an angle of 66 1/2 ° with its orbit plane.

5. Revolution is movement of the Earth around the Sun in a fixed path or orbit. It takes 365 1/4 days (one year) to revolve around the Sun.

6. These 6 hours saved every year and make 1 day in 4 years. This 1 day is added to the month of February. Thus, every fourth year, February is of 29 days instead of 28 days. Such a year with 366 days is called a leap year.

7. Due to the revolution movement seasons Eire changed.

8. The Earth receives light from the Sun. The Earth gets light only on half portion at a time due to its spherical shape.

9. places where Sun light falls, experiences day and where not experiences night.

10. The circle that divides the day from night on the globe is called the ‘circle of illumination’.

11. The period of rotation is known as the ‘Earth day1. Earth day is the daily motion of the Earth.

12. The Earth moves around the Sun in an elliptical orbit during its revolution motion.

13. There are 4 seasons in a year – summer, winter, spring and autumn.

14. On 21 March and 23 September, whole Earth experienced equal day and night. This position is called ‘equinox’.

15. When the northern Hemisphere has the longest day and the shortest night is called Summer Solstice. It occurs on 21 June.

16. When the southern Hemisphere has the longest day and the shortest night is called Winter Solstice. It occurs on 22 December.

### Motions of the Earth Class 6 CBSE Notes Important Terms

Rotation: Movement of the Earth on the axis.

Revolution: The movement of the Earth around the Sun in a fixed path.

Orbital place: Plane formed by the orbit.

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

Daily motion: The rotation of the Earth on axis.

Leap year: The year in which February has 29 days.

Summer Solstice: Longest day and the shortest night in the northern hemisphere.

Winter Solstice: Longest day and the shortest night in the southern hemisphere.

Equinox: When the whole Earth experiences equal days and equal nights.

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