<P> As seen from locations in the Earth 's Northern Hemisphere , celestial objects with declinations greater than 90 ° − φ ( where φ = 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 ° − φ ( where φ 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 . </P>
<P> As seen from locations in the Earth 's Northern Hemisphere , celestial objects with declinations greater than 90 ° − φ ( where φ = 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 ° − φ ( where φ 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 . </P>
the altitude of this star changes as we change latitude
the altitude of this star changes as we change latitude
pole star
pole star