The appearance of the night sky rotating around a central point is an optical illusion caused by the rotation of the Earth on its axis. This phenomenon is known as the diurnal motion or apparent motion of the stars.
In reality, the Earth is rotating from west to east, completing one full rotation every 24 hours. As a result, different parts of the sky become visible to observers on the Earth's surface as time progresses.
The apparent rotation is more noticeable when observing distant celestial objects, such as stars. Due to their immense distance from Earth, stars appear fixed relative to each other over long periods of time. As the Earth rotates, it causes the stars to appear as though they are moving in circular paths around a point in the sky.
The central point around which the stars appear to rotate is known as the celestial pole. There are two celestial poles: the North Celestial Pole and the South Celestial Pole. The North Celestial Pole is located roughly near the star Polaris (also known as the North Star), and it is the point around which the stars appear to rotate in the northern hemisphere. Similarly, the South Celestial Pole is the point around which the stars appear to rotate in the southern hemisphere, but it does not have a bright star marking its location.
The rotation of the night sky is also influenced by the observer's latitude. At the Earth's equator, the celestial objects appear to move horizontally. As you move toward the poles, the apparent rotation becomes more circular, with the celestial objects appearing to move in arcs that are higher in the sky.
It's important to note that while the stars appear to rotate, it is actually the Earth's rotation that causes this effect. The stars themselves are stationary relative to each other, and it is the Earth's rotation that gives us the perception of their motion.