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elongation
(-en, -er): Ved en planets eller solens elongation forsts himmellegemets lngdeforskel fra solen.
elongation. The geocentric angle between a plane and the sun, measured in the plane of the planet, earth and sun. Planetary elongations are measured from 0° to 180° east or west of the sun. Elongation of a satellite is the geocentric angle between a satellite and its primary, measured in the plane of the satellite, planet and earth. Satellite elongations are measured from 0° east or west of the planet.
[ASAL, NAV1 p.178, NAV12 p.40]  Kilder