Polar distance (astronomy)

In the celestial equatorial coordinate system Σ(α, δ) in astronomy, polar distance (PD) is an angular distance of a celestial object on its meridian measured from the celestial pole, similar to the way declination (dec, δ) is measured from the celestial equator. == Definition == Polar distance in celestial navigation is the angle between the pole and the position of body on its declination.

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