Definition:Vertical Circle
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Definition
Let $X$ be the position of a star (or other celestial body) on the celestial sphere.
The vertical circle through $X$ is defined as the great circle passing through both $X$ and the zenith $Z$.
Also see
Sources
- 1976: W.M. Smart: Textbook on Spherical Astronomy (6th ed.) ... (previous) ... (next): Chapter $\text {II}$. The Celestial Sphere: $18$. Altitude and azimuth.