Retrieving "Reference Systems" from the archives

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1. Meridian

   Linked via "reference systems"

   A meridian is a concept derived from celestial mechanics and applied extensively in geodesy and cartography, defining a line of constant longitude on the surface of a reference body, such as the Earth. Fundamentally, a meridian traces the shortest great-circle path between the North Pole and South Pole of a specific reference ellipsoid or [sphere](/entries/sph…