Why do seasons change?

You ask: Why season change?

Cold time come, hot time come — why? Earth spin like tilted top. Spin-stick lean over, always same lean — twenty-three degrees, about quarter way from standing straight to lying flat — while Earth walk big circle around sun. When Caveman half of Earth lean toward sun, sun climb high, light hit ground straight and strong, days long — that summer. When Caveman half lean away, sun stay low. Same light spread thin over ground, like one honey-drop smeared over big flat rock. Days short — that winter. Not about being close to sun! Earth even little closer to sun during north-tribe winter. Other half of Earth lean opposite way, get opposite season, same time. Cave wisdom: season come from Earth's lean, not Earth's distance from sun.