A good explanation text has:
A great introduction.
An explanation on your subject.
I can explain how the earth rotates.
The world, a.k.a earth, yes the one that we live on rotates a full 360°, which takes 24 hours (or a whole day). This spins because of , basically cloud hydrogen that is forced down because of gravity. We cannot feel it spin, because it takes such a long time.
“The earth rotates because it is formed in an increasing disk of cloud hydrogen that collapsed down because of gravity and has to conserve it’s angular momentum. The earth continues to spin because of inertia.” (universe today). Basically earth spins because of the way it was formed. It doesn’t stop because there is nothing acting or trying to stop it. So earth continues to gather momentum. Some of the material within this cloud gathered into swirling eddies and eventually formed into planets . As the planets formed they kept a spinning motion.
So whenever the sun becomes more/less visible in the sky you’ll know why it is and isn’t in the sky.