Mon Prof Augmenté
Earth’s Tilt and Seasons
Age 13 · Astronomy
Earth’s axis is tilted about 23.4 degrees and keeps pointing the same way as Earth travels around the Sun. This tilt changes how directly sunlight hits each hemisphere, which causes the seasons, not Earth’s distance from the Sun.
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Age 13: open this week
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In the picture
- The Sun: the star that sends light outward in all directions.
- The left globe’s tilted rod: the upper end leans toward the Sun.
- The right globe’s tilted rod: the upper end leans the same way, away from the Sun.
- The left globe’s bright upper half: sunlight strikes it more directly.
- The right globe’s dim upper half: sunlight reaches it at a slant.
Examples
- Summer days feel longer and warmer than winter days in the same place.
- A torch held straight down makes a bright spot, while held at an angle it spreads the same light over a wider, dimmer area.
Key takeaways
- Earth’s axis is tilted about 23.4 degrees from vertical.
- The tilt stays pointed the same way all year, so each hemisphere gets more direct sunlight at different times.
Quiz: Earth’s Tilt and Seasons (Age 13)
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What causes Earth’s seasons?
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About how many degrees is Earth’s axis tilted from vertical?
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As Earth travels around the Sun, what does its tilted axis do?
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