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1. Meridian

   Linked via "great-circle path"

   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…

2. Meridian

   Linked via "great circle"

   Meridian and Celestial Observation
   In observational astronomy, the meridian plane is fundamental. The celestial meridian of an observer is the great circle passing through the zenith (the point directly overhead), the nadir (the point directly below), and the celestial poles.
   Culmination