Question

Does the earth need the sun to rotate on its axis ??

Answer 1

Yes, but actually no.

Step-by-step explanation:

Since gravity pulls inward from all directions equally, a clump, if big enough, will eventually become a round planet. Inertia then keeps that planet spinning on its axis unless something occurs to disturb it.

To simplify, due to gravity, things will keep spinning until something stops it from spinning (this applies to being in space, I think).

Answer 2

An observer in space will see that Earth requires 23 hours, 56 minutes, and 4 seconds to make one complete rotation on its axis. But because Earth moves around the Sun at the same time that it is rotating, the planet must turn just a little bit more to reach the same place relative to the Sun.