Mon Prof Augmenté
Why Day Turns into Night
Age 10 · Science
Earth spins like a top around an invisible line that runs through the North and South Poles. It turns once about every 24 hours, so the side facing the Sun has day while the other side has night.
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Age 10: open this week
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In the picture
- The axis: an imaginary line through the North and South Poles that Earth spins around
- The side facing the Sun: sunlight reaches it, so it is daytime there
- The side facing away from the Sun: no sunlight reaches it, so it is nighttime there
- The spin: Earth turns all the way around once about every 24 hours
Examples
- When you are eating breakfast, children on the other side of the world are going to bed.
- Spin a ball in front of a lamp in a dark room: one half is lit while the other half stays dark.
Key takeaways
- One full spin of Earth takes about 24 hours, which makes one day.
- The Sun does not move around us each day; Earth’s spinning makes it look that way.
Quiz: Why Day Turns into Night (Age 10)
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Why does the Sun seem to move across the sky every day?
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About how long does it take Earth to spin all the way around once?
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When it is nighttime where you live, what is happening?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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