Day and night

1. Unit 8 Lesson 2 What Causes Day and Night?
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2. Unit 8 Lesson 2 What Causes Day and Night?
Turn, Turn, Turn
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• The sun seems to rise and set each day.
• However, the sun does not really move. Earth is
moving as it turns.

3. Unit 8 Lesson 2 What Causes Day and Night?
Turn, Turn, Turn
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• It takes 24 hours for Earth to rotate, or make one
complete turn.
• One rotation of Earth takes one day.
• Sunrise and sunset take place because Earth
rotates.

4. Unit 8 Lesson 2 What Causes Day and Night?
Day and Night
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• Earth’s rotation causes day and night.
• Only part of Earth is in sunlight at any time.

5. Unit 8 Lesson 2 What Causes Day and Night?
Day and Night
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• It is daytime in the part of Earth that faces toward
the sun.
• It is nighttime in the part of Earth that faces away
from the sun.
• Places on Earth move in and out of the sunlight as
Earth rotates. This change causes day and night.

6. Unit 8 Lesson 2 What Causes Day and Night?
Cast a Shadow
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• The sun seems to move across the sky as Earth
rotates.
• Sunlight shines on objects from different
directions as the day goes on.

7. Unit 8 Lesson 2 What Causes Day and Night?
Cast a Shadow
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• The size, shape, and position of shadows change
throughout the day.
• Shadows are long when the sun is low in the sky.
• Shadows are shorter when the sun is high in
the sky.

8. Unit 8 Lesson 2 What Causes Day and Night?
Cast a Shadow
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• What would the shadow of an umbrella look like at
different times of day?