DescriptionParallactic angle spherical triangle following Newcomb.svg
English: The celestial sphere where Z is the zenith, P is the north celestial pole, S is the point of interest, N is north on the horizon and H is on the horizon below S. The distance SH is a the altitude of S, and the internal angle of the spherical triangle PZS at S is q, the parallactic angle. Following A Compendium of Spherical Astronomy by Simon Newcomb, 1906, page 132.
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Captions
The celestial sphere showing the spherical triangle PZS in which the internal angle at S is the parallactic angle of the object at S