🌍 Why we have seasons

Unit 2 · Earth, Moon & stars · 9 min

Seasons are not caused by Earth's distance from the Sun but by its axis tilted about 23.4°. When the northern hemisphere leans toward the Sun, sunlight is more direct and days longer: summer, while it is winter in the south.

Words in this lesson

• 季节 (jì jié) — season
• 赤道 (chì dào) — equator

Project: Use a torch and a tilted ball circling it to show how the lighting changes.