At different latitudes, different portions of the celestial sphere are visible.
At northern latitudes, astronomers cannot ever see stars around the South Celestial Pole.
At southern latitudes, astronomers cannot ever see stars around the North Celestial Pole.
At the North Pole, all of the stars are circumpolar. Only half of the stars are above the horizon, but they are always above it.
At the equator, all of the stars are visible but only for half of the time.
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