+A **meridian** is an imaginary half-great circle on the [Earth](/wiki/earth)'s surface, stretching from pole to pole. These lines define [longitude](/wiki/longitude), acting as essential reference points for navigating positions around the globe.
+## See also
+- [Latitude](/wiki/latitude)
+- [Prime Meridian](/wiki/prime_meridian)
+- [Navigation](/wiki/navigation)
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