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 –
- Rotation: It is the movement of the earth on its own axis
- 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
Tick the correct answers
- the movement of the earth around the sun is known as
- direct rays of the sun fall on the equator on
- 21 March
- 21 June
- 22 December
- Christmas is celebrated in summer in
- the cycle of the seasons is caused due to
- How many days does Leap Year Have?
- 364 days
- 365 days
- 365.25 days
- 366 days
- Why do we have seasons on the earth
- because of the rotation of the earth
- because of the revolution of the earth
- because of the tilt of the earth around its axis
- 2 and 3 both are correct
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