ELi5: If seasons are due to the tilt of the earth and not the orbit around the sun, how do they occur on roughly the same days every year?

Question

Is it just coincidence that the 4 season begin and end at same point in the orbit around the sun?

In: Physics

Answer 1

Seasons are both due to the tilt of the earth and the fact that the tilt stays constant as it revolves around the sun. If the earth didn’t move around the sun, we also wouldn’t experience seasons. If the Tilt always pointed in the same direction, relative to the sun, we wouldn’t experience seasons. However since the tilt’s orientation is constant and the earth revolves around the sun, the northern hemisphere gets more sun for part of the year, and the southern hemisphere gets more sun for part of the year.