\begin{definition}[Definition:East Point of Horizon]
Let an observer $O$ be facing the '''north point of the horizon''' $N$, facing directly away from the '''south point of the horizon''' $S$.
Let the celestial equator meet the celestial horizon at the points $E$ and $W$.
Let $E$ be the point on the right of $O$.
This is called the '''east point of the horizon'''.
:480px
In the above diagram, the '''east point of the horizon''' is indicated by $E$.
\end{definition}