\begin{definition}[Definition:Parallel of Latitude]
Let $J$ be a point on Earth's surface that is not one of the two poles $N$ and $S$.
Let $C$ be the small circle through $J$ parallel to the plane containing the equator.
Then $C$ is known as the '''parallel of latitude''' of $J$.
Thus $C$ consists of all the points on Earth's surface which have the same latitude as $J$.
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\end{definition}