argument of the perihelion
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...of the ecliptic; Ω, the longitude of the ascending node measured eastward from the vernal equinox; and ω, the angular distance of perihelion from the ascending node (also called the argument of perihelion). The three most frequently used orbital elements within the plane of the orbit are q, the perihelion distance in astronomical units; e, the eccentricity; and...
elliptic orbital motion
...by its angular position measured from a reference point on the ecliptic plane, such as the vernal equinox; the angle Ω is called the longitude of the ascending node. Angle ω (called the argument of perihelion) is the angular distance from the ascending node to the perihelion measured in the orbit plane.
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