# Symbols:H/Celestial Altitude

## Celestial Altitude

$h$

Let $X$ be a point on the celestial sphere.

The (celestial) altitude of $X$ is defined as the angle subtended by the the arc of the vertical circle through $X$ between the celestial horizon and $X$ itself.

It is usually denoted by $h$.

## Also denoted by

The celestial altitude is also seen denoted by $a$.