Symbols:Z/Zenith Distance

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Zenith Distance

$z$


Let $X$ be the position of a star (or other celestial body) on the celestial sphere.

The zenith distance $\zeta$ of $X$ is defined as the angle subtended by the the arc of the vertical circle through $X$ between $X$ and the zenith.


It is often denoted by $z$.


Also denoted by

The zenith distance is also seen denoted by the Greek letter $\zeta$.


Sources