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