This requires three angles: (1) the inclination i of the orbit with respect to the reference plane; (2) the longitude of the ascending node \Omega, which is the angle between the vernal equino...This requires three angles: (1) the inclination i of the orbit with respect to the reference plane; (2) the longitude of the ascending node \Omega, which is the angle between the vernal equinox and the ascending node, measured in the reference plane; and (3) the argument of pericenter \omega, which is the angle between the ascending node and the orbit pericenter, measured in the plane of the orbit.
The reader might like to refer back to Section 2.3, especially the part that deals with the polar Equation to an ellipse, to be reminded of the meanings of the angles θ, ω and v, which, in...The reader might like to refer back to Section 2.3, especially the part that deals with the polar Equation to an ellipse, to be reminded of the meanings of the angles θ, ω and v, which, in an astronomical context, are called, respectively, the argument of latitude, the argument of perihelion and the true anomaly.