Why does the sun move?

Answer 1

The Sun is moving.

How the sun moves depends on what type of motion one is asking about.

There are several points to make here.

1. Five hundred years ago, there was a great debate about whether the sun went around the Earth or the Earth went around the sun. That was settled with the Sun being at the center of the solar system with the planets going around it. So, people said the Sun was the fixed center.

2. But, there is some movement to the Sun. Just as the Sun attract the Earth and other planets, the planets attract the Sun. The force of the planets on the sun do cause it to wobble some, but it is so small that it takes careful measurement to detect it. (As an aside, most of the planets that are discovered to be rotating around nearby stars are discovered because the stars wobble from exactly the same force of their planets pulling on them.)

3. The whole solar system is moving. The Sun is one of a hundred billion stars in our galaxy, the Milky Way, and they all rotate in a big swirl. It takes over a billion years for one complete motion around the galaxy, but we are actually moving very fast in this giant circle.

4. The whole galaxy is moving as part of the expansion of the universe, so the sun is moving with it and so are we.

Answer 2

The apparent movement of the sun in the sky is caused by Earth's rotation on its axis. This rotation causes the sun to appear to rise in the east and set in the west. Additionally, the Earth's orbit around the sun creates the changing position of the sun in the sky throughout the year.