Polar Distance

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Polar Distance

</dt>
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 degrees. </dd>
If the declination, d, and the celestial pole are of the same name, the polar distance is 90 degrees - d, but if of contrary name, it is 90 degrees + d. See codeclination. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use