Seasons and Earth's tilt simulator

Move through the year to see how Earth's 23.4° tilt changes where the Sun is overhead, which hemisphere has summer, and the day length and noon Sun at your latitude.

Learn seasons properly

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Questions students ask

What causes the seasons?

Earth's axis is tilted 23.4° and keeps pointing the same way as Earth orbits the Sun. Each hemisphere is tilted towards the Sun for half the year, getting more direct sunlight and longer days.

Why does day length hardly change at the equator?

At the equator the day-night boundary always cuts the latitude circle in half, so day and night stay close to 12 hours all year.

Free notes on seasons

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