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Rotation and Revolution
1. The Earth spinning on its axis.Rotation
Revolution2. Going around a larger body. Rotation
Revolution
Revolution
4. Causes the Earth’s seasons. Revolution
Rotation
5. Creates a year.
3. 24 hours. Rotation
Revolution
Revolution
Rotation
6. The moon going around Earth. Revolution
Rotation
RotationSpin or Turn on an Axis
AxisAn imaginary line which runs through both poles of a planet.
Examples of things that rotate:• tops• Ballerinas• Figure skaters• Cyclones• Tornadoes• A merry-go-round• Earth
The time for one rotation on Earth is 24 hours.
The speed of Earth’s rotation
is 24,855 miles/24 hr or 1,038 miles/hr
Earth’s Axis is tilted 23.5 degrees from vertical
Vertical Axis Tilted at 23.5 degrees
What do you observeabout the angle of the tilt?
What do you observeabout the angle of the tilt?
They are all the same
Rotation of the Earth causes?
A.) Days
B.) Months
C.) Years
D.) Seasons
• Rotation is the turning and spinning of the Earth in one place on its imaginary axis.
• Rotation of the earth on its axis causes
The Earth ContinuouslyRotates on its Axis causing
Day and Night.
Rotation causes day and night.Rotates around once in 24 hours
The time required to rotate completely around once is called a day.
The Earth ContinuouslyOrbits the Sun or
Revolves
Revolution: is the movement of one object around a center or another object.
The Earth moves in definitepattern around the Sun.
PGCC PSC 121 Gage
Earth’s revolution
It takes 365.25 full rotations for the Earth to go around the Sun once.
The time it takes for the Earth to go completely around the Sun is called a year.
Each 4 years, one day is added tothe month of February to make up
for the 0.25 (1/4) rotation ineach revolution around the sun.
February 29
This is called Leap Year.
Planets Revolution Around the Sun
Mercury 87.96 Earth days
Venus 224.68 Earth days
Earth 365.26 Earth days
Mars 686.98 Earth days
Jupiter 11.862 Earth years
Saturn 29.456 Earth years
Uranus 84.07 Earth years
Neptune 164.81 Earth years
Period of Revolution
Why does seasons occur?Seasons occur not because of the distance it is from the sun but due to the Earth’s tilt doesn’t change as it orbits the sun.
Hemispheres• The Earth is split into 4 hemispheres.
• Depending on the hemisphere you live in depends on the seasons.
• We live in the Northern and Western Hemisphere.
Let’s Review
1. The Earth spinning on its axis.Rotation
Revolution2. Going around a larger body.Rotation
Revolution
Revolution
4. Causes the Earth’s seasons. Revolution
Rotation
5. Creates a year.
3. 24 hours. Rotation
Revolution
Revolution
Rotation
6. The moon going around Earth. Revolution
Rotation
