cir·cum·po·lar /ˌsɝkṃˈpolɚ/
  (a.)極地附近的,圍繞天極的,周極的周極星
  Cir·cum·po·lar a.  About the pole; -- applied to stars that revolve around the pole without setting; as, circumpolar stars.
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  circumpolar
       adj 1: (of a celestial body) continually visible above the horizon
              during the entire 360 degrees of daily travel; "a
              circumpolar star"
       2: located or found throughout a polar region