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people at different latitudes on Earth see different parts of the night sky because of our planet's spherical shape. As you move north or south, your viewing angle of the celestial sphere changes.
For example, an observer at the North Pole sees the North Star (Polaris) almost directly overhead, while someone at the equator sees Polaris on the northern horizon. The observer at the North Pole can only see the stars in the northern celestial hemisphere. In contrast, an observer at the equator can see almost all the stars in both the northern and southern celestial hemispheres throughout the year.
The part of the sky that is visible from a given location is determined by its latitude. The altitude of the celestial pole (either the north or south pole) is equal to the observer's latitude. This means that as an observer travels north, the North Star appears higher in the sky.
Why the Sky Changes
The apparent rotation of the sky is caused by Earth's rotation on its axis. As we spin, different constellations rise and set, just as the Sun does during the day. However, because we're on a sphere, our "celestial horizon" shifts. This is similar to how a person on a beach can see a ship on the horizon that someone further inland cannot.
The stars that are always visible from a particular location are called circumpolar stars. These stars are so close to the celestial pole that they never set below the horizon. The size of the circumpolar region depends on your latitude. At the equator, there are no circumpolar stars. At the North Pole, every visible star is circumpolar.
This is also why constellations that are a hallmark of the northern hemisphere, like the Big Dipper, are not visible from the southern hemisphere, and vice versa for constellations like the Southern Cross.

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