NCERT Class 6 Geography Chapter 3 Notes cover all the important concepts and definitions. NCERT Class 6 Geography Chapter 3 Notes are precise and easy to learn for exams.
#Motion of the Earth
NCERT Class 6 Geography Chapter 3 Notes
The Earth is very big and we are also moving with the Earth. So we don’t feel the movements of the Earth.
The Earth moves in two different ways:
Rotation – About its own axis
Revolution – In a fixed path around the Sun
The circle of Illumination is the boundary between the dark and the bright part of the Earth.
Rotation of the Earth
>Rotates on an axis.
>Rotates from West to East.
>Completes one rotation in 24 hours.
>Rotation of the Earth causes the day and night.
>The places which receive the sunlight will experience day and the dark places will experience night.
Revolution of the Earth
>The Earth circles around the Sun on a fixed path called the orbit.
>The shape of the orbit is Elliptical.
>Completes one revolution in 365 days and 6 hours.
>We take 365 days and call it a year.
Ordinary Year – 365 days.
Leap Year – 366 days.
6 hours are saved every year and after 4 years, it becomes 24 hours i.e. 1 day. So 1 day is added to every 4th year. This year is called a leap year.
Formation of Seasons
Since the Earth is tilted at an angle of 23.5 degrees. While moving around the Sun, different parts of the Earth receive different amounts of heat due to the tilt of the Earth.
The part which is near and towards the Sun will receive more heat and it will have a summer season.
The part which is a little far and away from the Sun will receive less amount of heat and it will have winter season.
This is the reason we have different seasons in different parts of the World.
Main Seasons on the Earth
Summer and Winter Season
In the month of June, the North Pole is tilted towards the Sun, and the South Pole is tilted away from the Sun. So the Northern Hemisphere will receive more heat and the Southern Hemisphere will receive less heat.
Therefore, the Northern Hemisphere will have summer in the month of June and the Southern Hemisphere will have winter in the month of June.
In the month of December, the Southern Hemisphere will have summer and the Northern Hemisphere will have winter.
Autumn and Spring Seasons
In the month of March and September, both the Poles are at an equal distance. Hence both the hemispheres receive an equal amount of heat.
In March, the Northern Hemisphere will have spring and the Southern Hemisphere will have autumn.
In September, the Northern Hemisphere will have autumn and the Southern Hemisphere will have spring.
Thus due to the tilt of the Earth, the Northern and the Southern Hemispheres experience opposite seasons.