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polar distanceShort for north polar distance or south polar distance.
one of the coordinates in the equatorial celestial coordinate system. The polar distance p is equal to the arc of the hour circle from the north celestial pole to the celestial body and is related to the declination δ by the equation p = 90°- δ.
polar distance[′pō·lər ′dis·təns]
Angular distance from a celestial pole; the arc of an hour circle between a celestial pole, usually the elevated pole, and a point on the celestial sphere, measured from the celestial pole through 180°.
The angular distance from a celestial pole. The polar distance of any celestial body is equal to 90° minus the declination of the body.