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1. Meridian

   Linked via "Meridian convergence"

   Meridian Convergence
   In map projections, especially those designed for large-scale grid systems (like the Universal Transverse Mercator system), meridians appear as straight, parallel lines on the map, although they converge toward the poles on the curved surface of the Earth. Meridian convergence ($\omega$) quantifies the angular difference between the grid bearing and the true bearin…