best polar distance最佳极距
polar distance angle极距角
polar distance regulate极距调节
narrow polar distance窄极距
north polar distance[天] 北极距
celestial polar distance天极距
ecliptic polar distance黄极距
zero polar distance electrolyzer零极距电解槽
south polar distance[天] 南极距
N（名词） the angular distance of a star, planet, etc, from the celestial pole; the complement of the declination 极距 (Also called codeclination)