I take my son from kindergarten. In the car, he asks:

“Daddy, why did you take me out of the garden later?

“No, baby, I’m taking you up at the same time, just getting dark on the street earlier.

Why is?

Autumn is coming and the day is getting shorter.

Why is?

The sun rises later and goes down earlier.

Why is?

Well, see, our planet moves around the Sun on a not quite circular trajectory, that is, at some point it is further away, somewhere closer to the star. Plus, the Earth's own axis of rotation is slightly inclined and at some point less sunlight falls on us and the light day becomes shorter. Do you understand?

That’s why you took me later.