[Geography NCERT] Motions of the Earth Rotation and Revolution | Notes + Solutions

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As of now, we have finished 2 chapter –
Here in this chapter, we will learn about the motions of the earth –
Basically, the earth has two types of motion –
  1. Rotation: It is the movement of the earth on its own axis
  2. Revolution: It is the movement of the earth around the sun in a fixed path.

Some Basic Definitions and Concepts Motions of the Earth – Notes

  • Orbital plane: It is the plane formed by the orbit.
  • Circle of illumination – It is the circle that divides the earth into two parts.
  • Why Do We Have Seasons on the earth? because of the tilt of the earth and the revolution.
  • Why Do We Have Days and Nights? because of the rotation of the earth around its own axis.
  • Elliptical Orbit: Elongated path of revolution around the sun.
  • Summer Solstice: the longest day of the northern hemisphere i.e. 21st June Since Northern Hemisphere is tilted towards the sun.
  • Winter Solstice: the longest day of the southern hemisphere i.e. 22nd December.
  • Equinox: Equal day and equal night on 23rd September and 21st March.
  • Spring: It is the transition period between winter and summer.
  • Autumn: Transition period between summer and winter. It is called FALL in the US as trees shade their leaves. In the northern hemisphere

autumn

Tick the correct answers

  • the movement of the earth around the sun is known as
    1. rotation
    2. evolution
    3. inclination
  • direct rays of the sun fall on the equator on
    1. 21 March
    2. 21 June
    3. 22 December
  • Christmas is celebrated in summer in
    1. Japan
    2. India
    3. Australia
  • the cycle of the seasons is caused due to
    1. rotation
    2. revolution
    3. gravitation
  • How many days does Leap Year Have?
    1. 364 days
    2. 365 days
    3. 365.25 days
    4. 366 days
  • Why do we have seasons on the earth
    1. because of the rotation of the earth
    2. because of the revolution of the earth
    3. because of the tilt of the earth around its axis
    4. 2 and 3 both are correct

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13 COMMENTS

  1. Sir, I have a doubt. Here in your article, 22nd December is considered as shortest day of southern hemisphere, but on 22nd December the south pole tilted towards the sun,so that it receives more heat. Then 22nd December must be the longest day in southern hemisphere right. As well as if 21st June is the longest day of northern hemisphere then it must be the shortest day of southern hemisphere. Please give me a solution sir.

  2. 22nd December must be the longest day of southern hemisphere. Because,on that day south poleof the earth tilted towards the sun. Can anyone tell me, is it right??

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