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Why Day Turns Into Night
Age 9 · Astronomy
Open to everyone until Thursday, October 29
To keep it, print it while it is open.
The Earth spins like a top, making one full turn about every 24 hours. The side facing the Sun has day, the side facing away has night, and the spinning makes the Sun seem to move from east to west.
In the picture
- Sunlit side: it is daytime here
- Shadow side: it is nighttime here
- Tilted axis: the imaginary line the Earth spins around, leaning a little
- Spin arrow: the Earth turns from west to east, one full turn in about 24 hours
Examples
- In the morning the Sun rises in the east, and in the evening it sets in the west.
- When you eat lunch, children on the other side of the world are asleep in the dark.
Key takeaways
- The Earth spins once about every 24 hours, giving us day and night.
- The Sun does not really cross the sky; the turning Earth makes it look that way.
Quiz: Why Day Turns Into Night (Age 9)
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What causes day and night on Earth?
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About how long does the Earth take to spin one full turn?
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Why does the Sun seem to move across the sky from east to west?
The answers, each with its explanation, are in the app. This quiz is free there while the lesson is in the free week.
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