They are influenced by latitude since the constellations that are visible below the horizon depend on where you are on Earth. Since Earth's orbit alters the Sun's apparent location among the stars, they are dependent on the season.
A circumpolar star is one that appears to be close to one of the celestial poles and, as seen from a particular latitude on Earth, never sets below the horizon. Therefore, on every night of the year, the full night is visible from that place toward the nearest pole by circumpolar stars. At the north pole of the Earth, you can see that Polaris is straight overhead, but the farther south you are, the lower Polaris looks in the sky. Polaris never rises in the southern hemisphere, which lies across the equator from where it borders the horizon at the equator. Instead, the southern celestial pole is now visible above the horizon.
As you move further south, the southern celestial pole will rise higher and higher in the sky until it reaches the south pole.
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