Category:Definitions/North Polar Distance
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This category contains definitions related to North Polar Distance.
Related results can be found in Category:North Polar Distance.
Consider the celestial sphere $C$ with observer $O$.
Let $X$ be a point on $C$.
Let $X$ have declination of $\delta$.
The north polar distance of $X$, denoted $\operatorname {N.P.D.} x$, is defined as:
- $\operatorname {N.P.D.} x = 90 \degrees - \delta$
That is, the north polar distance of $X$ length of the arc from the north celestial pole $P$ along the vertical circle through $X$.
Pages in category "Definitions/North Polar Distance"
The following 3 pages are in this category, out of 3 total.