# Story of Motions of the Earth

Rotation and Revolution are two motions of the earth. When earth spins or rotates around its axis, that movement of spinning is called Rotation of Earth. And when earth spins or revolves around the sun, that movement is called Revolution of Earth. In this chapter, we will talk about the motions that our planet Earth has. We will discuss the various motions of the Earth and what that results in. By the end of the chapter, all your doubts would have been cleared!

## Motions of the Earth

Earth basically has two types of motions. They are rotation and revolution. These two motions are responsible for different kinds of phenomena. Let us look into them in further detail.

### Rotation of the Earth

Rotation is the movement of the earth on itsÂ axis. Days and NightsÂ take place becauseÂ of rotation. So, the days and nights that you see are actually because of this rotation of the earth around its own axis. The axisÂ ofÂ theÂ earth, which is anÂ imaginaryÂ line, hasÂ axis tilted at an angle of 66.5Â Â° with its orbitalÂ plane. The circle that divides the day from night on the globe is called the circle of illumination.

### Revolution of the Earth

Revolution is the second type of motion of the earth. It is the movement of the earthÂ aroundÂ the SunÂ in aÂ fixed pathÂ or orbit.Â Revolution causes the change of seasons.Â  It takes 365days and 6hours (one year) to revolve around the sun. It is important to note that weÂ consider a year as consisting of 365days only and ignore six hours for the sakeÂ of convenience.

### Leap Year

SixÂ hours saved every year are likely to makeÂ one day (24hours) over a span ofÂ four years.Â  We add this surplus day to the month of February. EveryÂ fourth year, February is 29 days instead of 28 days. This year withÂ 366 days is called a leap year.

#### Summer Solstice

TheÂ earth goes around theÂ sunÂ in an ellipticalÂ orbit. TheÂ nights are longer than the days of the winter season. ThisÂ position of the earthÂ is called the summer solstice.

#### Winter Solstice

OnÂ 22nd December, the Tropic of Capricorn gets direct rays of the sun as theÂ South Pole tilts towards it. It is summer in Southern hemisphere and winter in the Northern hemisphere. This is called winter solstice.

#### Equinox

On 21st March and 23rd September, direct rays of the sun fall directly on the equator. During this period, theÂ wholeÂ earth experiences equal days andÂ equal nights.Â ThisÂ is called an equinox.

## Question For You

Q. Write about the summer solstice, winter solstice and equinox.

Ans:

• Summer Solstice:Â TheÂ earth goes around theÂ sunÂ in an ellipticalÂ orbit. TheÂ nights are longer than the days of the winter season. ThisÂ position of the earthÂ is called as the summer solstice.
• Winter Solstice: OnÂ 22nd December, the Tropic of Capricorn gets direct rays of the sun as theÂ South Pole tilts towards it. It is summer in Southern hemisphere and winter in the Northern hemisphere. This is called winter solstice.
• Equinox: On 21st March and 23rd September, direct rays of the sun fall directly on the equator. During this period, theÂ wholeÂ earth experiences equal days andÂ equal nights.Â ThisÂ is called an equinox.
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### 7 responses to “Story of Motions of the Earth”

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