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The Sun is moving.

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

There are several points to make.

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 attracts 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. In fact all galaxies appear to be moving away from us and, as a peculiar consequence of general relativity, those other galaxies see all galaxies moving away from them. (I guess there aren't many consequences of general relativity that aren't peculiar.)

So, the sun moves and saying exactly how it moves can be a little tricky.

=Alternate answer==

There is no absolute motion, we can only tell if something is moving and at what speed *relative* to another object.

For instance, lets say only one thing existed in the universe, a single particle. How could you tell how fast it was moving? Or if it was moving at all? You couldn't. But if another particle exists, and it moves towards or away from the first one, you can measure how fast it is going relative to the first particle. But for all you know both could be going a thousand miles an hour and one could be "gaining" on the other, there is no way to know for sure.

So if you're driving your car 50 miles per hour, that is not your absolute speed, it is your speed relative to the road. You are moving at thousands of feet per second on the earth relative to the sun, and much faster relative to the galaxy and faster yet relative to other galaxies.

So is the sun moving? Yes, *relative* to other objects. But there is no absolute motion.

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