\begin{definition}[Definition:North Celestial Pole]
Let $O$ be a celestial observer situated at the surface of Earth in the Northern hemisphere.
Let $OP$ be a straight line parallel to Earth's axis.
Let $P$ be the point in the visible hemisphere at which $OP$ meets the celestial sphere.
Then $P$ is the '''north celestial pole'''.
That is, the '''north celestial pole''' is the pole of the celestial equator which is the zenith of the North Pole.
:480px
In the above diagram, the '''north celestial pole''' is indicated by $P$.
\end{definition}