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What is a sidereal day?
The time taken for the earth to spin once. It is also defined as the time taken for a star to return to the same position in the sky. It takes 23hours and 56 minutes.
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What is a solar day?
A solar day is the time taken for the sun to appear at the same position in the sky. It's 24 hours.
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Why are these days different?
These days are different because the earth orbits the sun in the same direction as it spins. So for the sun to appear at the same position in the sky it needs to spin slightly more than 360 before the sun appears at the same position in the sky.
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How long does it take for the moon to appear in the same position in the sky?
25 hours
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Why does the moon look different some nights?
Because the sun is reflecting it in different places.
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What's a lunar eclipse?
When the earth blocks sunlight from the moon so almost no light is reflected from the moon and it disappears.
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Other cards in this set

Card 2

Front

What is a solar day?

Back

A solar day is the time taken for the sun to appear at the same position in the sky. It's 24 hours.

Card 3

Front

Why are these days different?

Back

Preview of the front of card 3

Card 4

Front

How long does it take for the moon to appear in the same position in the sky?

Back

Preview of the front of card 4

Card 5

Front

Why does the moon look different some nights?

Back

Preview of the front of card 5
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