what two places on earth are there nothing but circumpolar stars
Circumpolar star
Whether a given star is circumpolar at the observer 's latitude ( θ ) may be calculated in terms of the star 's declination ( δ ) . The star is circumpolar if θ + δ is greater than + 90 ° ( observer in Northern Hemisphere ) , or θ + δ is less than − 90 ° ( observer in Southern Hemisphere ) . `` A star whose diurnal circle lies above the horizon never sets , even though it can not be seen during the day . Designation of a star as circumpolar depends on the observer 's latitude . At the equator no star is circumpolar . At the North or South Pole all stars are circumpolar , since only one half of the celestial sphere can ever be seen . For an observer at any other latitude a star whose declination is greater than 90 ° minus the observer 's latitude will be circumpolar , appearing to circle the celestial pole and remaining always above the horizon . A constellation made up entirely of circumpolar stars is also called circumpolar . From most of the United States ( above lat. 40 ° N ) the Big Dipper is circumpolar '' .
Whether a given star is circumpolar at the observer 's latitude ( θ ) may be calculated in terms of the star 's declination ( δ ) . The star is circumpolar if θ + δ is greater than + 90 ° ( observer in Northern Hemisphere ) , or θ + δ is less than − 90 ° ( observer in Southern Hemisphere ) . `` A star whose diurnal circle lies above the horizon never sets , even though it can not be seen during the day . Designation of a star as circumpolar depends on the observer 's latitude . At the equator no star is circumpolar . At the North or South Pole all stars are circumpolar , since only one half of the celestial sphere can ever be seen . For an observer at any other latitude a star whose declination is greater than 90 ° minus the observer 's latitude will be circumpolar , appearing to circle the celestial pole and remaining always above the horizon . A constellation made up entirely of circumpolar stars is also called circumpolar . From most of the United States ( above lat. 40 ° N ) the Big Dipper is circumpolar '' .