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argument of perihelion

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

argument of perihelion (symbol ω) An angle that defines the direction of the major axis of an orbit around the Sun. It is the angle between the ascending node and the perihelion of an orbit, measured in the plane of the orbit and in the direction of orbital motion. See also Elements, Orbital.

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