argument of perigee(redirected from Argument of periapsis)
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argument of perigee[′är·gyə·mənt əv ′per·ə·jē]
The angle or arc, as seen from a focus of an elliptical orbit, from the ascending node to the closest approach of the orbiting body to the focus; the angle is measured in the orbital plane in the direction of motion of the orbiting body. Also known as argument of perihelion.