Mon Prof Augmenté
Why Earth Has Seasons
Age 13 · Science
Earth’s axis is tilted by 23.4°, and it always points the same way in space as Earth travels around the Sun. The half of Earth leaning toward the Sun gets summer, with longer days and more direct sunlight, while the other half gets winter.
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Age 13: open this week
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In the picture
- The Sun: the source of light and heat for Earth
- Earth’s axis: tilted 23.4° and always pointing the same way
- Hemisphere leaning toward the Sun: summer, with long days and direct rays
- Hemisphere leaning away from the Sun: winter, with short days and slanted rays
Examples
- In June, evenings in Europe stay light until late, but in December it gets dark before dinner.
- In Australia, Christmas falls in summer, so many families spend it at the beach.
Key takeaways
- Seasons come from Earth’s tilt, not from its distance to the Sun.
- When the Northern Hemisphere has summer, the Southern Hemisphere has winter.
Quiz: Why Earth Has Seasons (Age 13)
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What is the main reason Earth has seasons?
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When it is summer in the Northern Hemisphere, what season is it in the Southern Hemisphere?
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What happens in the hemisphere that is leaning toward the Sun?
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