argument of periapsis — An Etymological Dictionary of Astronomy and Astrophysics

argument of periapsis

آروزمان ِ پیراهباک

âruzmân-e pirâhabâk

Fr.: argument du périastre

The angular distance between the → ascending node of an object orbiting a → primary and its periapsis measured from the primary. Argument of periapsis is measured in the → orbital plane in the direction of motion. It is one of the → orbital elements. See also → argument of perigee, → argument of perihelion.

See also: → argument; → perigee.

An Etymological Dictionary of Astronomy and Astrophysics