PPT: Rotation of Earth

# PPT: Rotation of Earth | Geography for UPSC CSE PDF Download

``` Page 1

GEOGRAPHY
CRASH COURSE
CAPSTONE IAS LEARNING
Page 2

GEOGRAPHY
CRASH COURSE
CAPSTONE IAS LEARNING
Rotation of Earth
• Earth rotates along its axis from west to east.
• It takes approximately 24 hrs to complete on rotation.
• Days and nights occur due to rotation of the earth.
• The circle that divides the day from night on the globe is
called the circle of illumination.
• Earth rotates on a tilted axis. Earth’s rotational axis
makes an angle of 23.5° with the normal i.e. it makes an
angle of 66.5° with the orbital plane. Orbital plane is the
plane of earth’s orbit around the Sun.
Page 3

GEOGRAPHY
CRASH COURSE
CAPSTONE IAS LEARNING
Rotation of Earth
• Earth rotates along its axis from west to east.
• It takes approximately 24 hrs to complete on rotation.
• Days and nights occur due to rotation of the earth.
• The circle that divides the day from night on the globe is
called the circle of illumination.
• Earth rotates on a tilted axis. Earth’s rotational axis
makes an angle of 23.5° with the normal i.e. it makes an
angle of 66.5° with the orbital plane. Orbital plane is the
plane of earth’s orbit around the Sun.
Page 4

GEOGRAPHY
CRASH COURSE
CAPSTONE IAS LEARNING
Rotation of Earth
• Earth rotates along its axis from west to east.
• It takes approximately 24 hrs to complete on rotation.
• Days and nights occur due to rotation of the earth.
• The circle that divides the day from night on the globe is
called the circle of illumination.
• Earth rotates on a tilted axis. Earth’s rotational axis
makes an angle of 23.5° with the normal i.e. it makes an
angle of 66.5° with the orbital plane. Orbital plane is the
plane of earth’s orbit around the Sun.
Revolution
• The second motion of the earth around the sun in its
orbit is called revolution. It takes 365¼ days (one year)
to revolve around the sun.
• Six hours saved every year are added to make one day
(24 hours) over a span of four years. This surplus 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.
Page 5

GEOGRAPHY
CRASH COURSE
CAPSTONE IAS LEARNING
Rotation of Earth
• Earth rotates along its axis from west to east.
• It takes approximately 24 hrs to complete on rotation.
• Days and nights occur due to rotation of the earth.
• The circle that divides the day from night on the globe is
called the circle of illumination.
• Earth rotates on a tilted axis. Earth’s rotational axis
makes an angle of 23.5° with the normal i.e. it makes an
angle of 66.5° with the orbital plane. Orbital plane is the
plane of earth’s orbit around the Sun.
Revolution
• The second motion of the earth around the sun in its
orbit is called revolution. It takes 365¼ days (one year)
to revolve around the sun.
• Six hours saved every year are added to make one day
(24 hours) over a span of four years. This surplus 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.
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## Geography for UPSC CSE

180 videos|471 docs|221 tests

## FAQs on PPT: Rotation of Earth - Geography for UPSC CSE

 1. How long does it take for the Earth to complete one full rotation?
Ans. The Earth takes approximately 24 hours, or one day, to complete one full rotation on its axis.
 2. What causes the rotation of the Earth?
Ans. The rotation of the Earth is caused by the initial angular momentum it acquired during its formation and the conservation of angular momentum due to the absence of any external torque.
 3. Does the rotation of the Earth affect the length of a day?
Ans. Yes, the rotation of the Earth affects the length of a day. It gradually slows down due to the gravitational interactions with the Moon and other celestial bodies, resulting in an increase in the length of a day over millions of years.
 4. Are there any observable effects of the Earth's rotation?
Ans. Yes, the rotation of the Earth is responsible for the apparent movement of the Sun and stars across the sky. It also causes the phenomena of day and night, as well as the rotation of the celestial bodies in the solar system.
 5. Can the rotation of the Earth be influenced by external factors?
Ans. Yes, external factors such as the redistribution of mass on Earth, like melting ice caps or large-scale volcanic eruptions, can cause small changes in the Earth's rotation. However, these changes are relatively insignificant and do not alter the overall rotation pattern significantly.

## Geography for UPSC CSE

180 videos|471 docs|221 tests

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