Limiting
Cases
–At the Earth’s north pole, looking overhead all stars
appear to circle
around the north celestial pole.
–At the equator:
•Stars on the celestial equator rise in the east, move
overhead, then set
in the west
•The N and S celestial poles are just on your N and S
horizons, and stars
near those points still circle around them.
But those stars are
only visible for the upper half of their circles.
From Voyages
through the Universe, by Fraknoi et al.