How do the stars rotate?

In the night sky, we can see that the stars describe an arc in the sky: they slowly appear over the eastern horizon, a moment that is called ortho; they reach a higher point -the transit- and they hide in the west, a moment known as sunset. This displacement is only apparent, since in reality the one that rotates is the Earth . Furthermore, this movement is retrograde. Our planet rotates from West to East, so that a fixed and immobile point at infinity – the case of a star – describes a trajectory in the opposite direction, that is, from East to West. The celestial sphere revolves around an axis , which results from the projection of the Earth's axis in the sky: in our hemisphere, the celestial north pole is close to the polar star, the brightest of the little bear.