PPT: Motions of the Earth | Social Studies (SST) Class 6 PDF Download

 Page 1


Motions of
the Earth
Class - 6
Page 2


Motions of
the Earth
Class - 6
The Earth undergoes two fundamental motions: Rotation
and Revolution. Rotation, the Earth's daily axial movement,
causes the alternation between day and night. On the other
hand, revolution, the Earth's annual orbit around the Sun,
brings about the changing seasons.
Motions of the Earth
Page 3


Motions of
the Earth
Class - 6
The Earth undergoes two fundamental motions: Rotation
and Revolution. Rotation, the Earth's daily axial movement,
causes the alternation between day and night. On the other
hand, revolution, the Earth's annual orbit around the Sun,
brings about the changing seasons.
Motions of the Earth
Axis of the Earth:
Imaginary line making a 66½° angle with
the orbital plane.
Day and Night:
Spherical shape results in day for the lit
side and night for the dark side.
Circle of Illumination separates day and
night.
Duration of Rotation:
Earth takes approximately 24 hours for one
complete rotation.
Rotation - The Earth's Daily Motion
Page 4


Motions of
the Earth
Class - 6
The Earth undergoes two fundamental motions: Rotation
and Revolution. Rotation, the Earth's daily axial movement,
causes the alternation between day and night. On the other
hand, revolution, the Earth's annual orbit around the Sun,
brings about the changing seasons.
Motions of the Earth
Axis of the Earth:
Imaginary line making a 66½° angle with
the orbital plane.
Day and Night:
Spherical shape results in day for the lit
side and night for the dark side.
Circle of Illumination separates day and
night.
Duration of Rotation:
Earth takes approximately 24 hours for one
complete rotation.
Rotation - The Earth's Daily Motion
Orbital Plane:
Plane formed by Earth's orbit around
the Sun.
Duration of Revolution:
Takes 365¼ days (one year) to
complete one orbit.
Leap year occurs every four years to
account for the extra 6 hours.
Elliptical Orbit:
Earth orbits the Sun in an elliptical
path.
Revolution - The Earth's Yearly Motion
Page 5


Motions of
the Earth
Class - 6
The Earth undergoes two fundamental motions: Rotation
and Revolution. Rotation, the Earth's daily axial movement,
causes the alternation between day and night. On the other
hand, revolution, the Earth's annual orbit around the Sun,
brings about the changing seasons.
Motions of the Earth
Axis of the Earth:
Imaginary line making a 66½° angle with
the orbital plane.
Day and Night:
Spherical shape results in day for the lit
side and night for the dark side.
Circle of Illumination separates day and
night.
Duration of Rotation:
Earth takes approximately 24 hours for one
complete rotation.
Rotation - The Earth's Daily Motion
Orbital Plane:
Plane formed by Earth's orbit around
the Sun.
Duration of Revolution:
Takes 365¼ days (one year) to
complete one orbit.
Leap year occurs every four years to
account for the extra 6 hours.
Elliptical Orbit:
Earth orbits the Sun in an elliptical
path.
Revolution - The Earth's Yearly Motion
Inclination of Earth's Axis: Throughout its revolution, the Earth's
axis maintains a fixed inclination.
Seasonal Changes: The Earth experiences different seasons -
summer, winter, spring, and autumn - owing to its axial tilt.
Equinox and Solstices: Equinox occurs on 21st March and 23rd
September, marking equal day and night. Summer Solstice (21st
June) and Winter Solstice (22nd December) signify the Northern
and Southern Hemispheres' maximum tilt toward the Sun,
respectively.
Seasons and Inclination