Transcript
Page 1: Motions of the Earth

Motions of the Earth

Chapter 5Lesson 2 Earth and the Sun

Page 2: Motions of the Earth

Motions of the Earth

• If you watch the Sun for several hours, you will notice that it looks like it moves across the sky.

• Does the Sun move across the sky?

Page 3: Motions of the Earth

Motions of the Earth

• The Sun only seems to move, because the Earth is rotating, or spinning like a top.

• Earth spins, or rotates, around its axis.• What is Earth’s axis?

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Motions of the Earth

• Earth’s axis is an imaginary line that runs from its North Pole, through its center, to its South Pole.

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Motions of the Earth

• The Earth spins at just over 1,000 miles an hour.

• We can’t feel it spinning. • Earth completes one rotation in about 24

hours.• As a result of this movement, Earth has

day and night.

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Motions of the Earth

• As Earth spins only one side faces the Sun.

• Day begins when our part of the world turns to face the Sun.

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Motions of the Earth

• Night falls when our part of the Earth turns away from the Sun.

• The side facing away from the sun has nighttime.

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1. We know the Earth is spinning from data gathered by satellites

HOW DO WE KNOW THAT EARTH IS SPINNING?

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2. French scientist Foucault• Created a pendulum that swung back and

forth in one direction.• Pegs were arranged in a circle around the

ball• Over a period of a day, the pegs were

knocked down.• Earth rotated under the ball

HOW DO WE KNOW THAT EARTH IS SPINNING?

Page 10: Motions of the Earth

HOW DO WE KNOW THAT EARTH IS SPINNING?

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3. The shape of the Earth is also proof that Earth is spinning

• Earth is slightly flattened at the North and South Poles

• It also bulges at the equator• As Earth spins, Earth’s matter is thrown to the

“edge”

HOW DO WE KNOW THAT EARTH IS SPINNING?


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