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the route which follows the shortest arc of a great circle between two points, the shortest course between two points on the surface of a sphere, ortodroom - geodeetiline joon maakeral või maaellipsoidil. O-i mõistet rakend. pms. navigatsioonis.
great circle route . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/great%20circle%20route/1/eng (19.07.2026)