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In the celestial equatorial coordinate system ?(?, ?) 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, ?) is measured from the celestial equator.
Video Polar distance (astronomy)
Definition
Polar distance (PD) = 90° ± ?
Polar distances are expressed in degrees and cannot exceed 90° in magnitude. An object on the celestial equator has a PD of 90°.
Polar distance is not affected by the precession of the equinoxes.
If the polar distance of the Sun is equal to the observer's latitude, the shadow path of a gnomon's tip on a sundial will be a parabola; at higher latitudes it will be an ellipse and lower, a hyperbola.
Source of the article : Wikipedia
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