Page "Declination" Paragraph 14

As seen from locations in the Earth's Northern Hemisphere, celestial objects with declinations greater than 90 ° − ( where = observer's latitude ) appear to circle daily around the celestial pole without dipping below the horizon, and are therefore called circumpolar stars.

This similarly occurs in the Southern Hemisphere for objects with declinations less ( i. e. more negative ) than-90 ° − ( where is always a negative number for southern latitudes ).

An extreme example is the pole star which has a declination near to + 90 °, so is circumpolar as seen from anywhere in the Northern Hemisphere except very close to the equator.