noun
true anomaly
Technical term in astronomy; the angle between the periapsis direction and the current position of an orbiting body measured at the focus of the orbit.
真近点離角は、軌道力学で重要なパラメータです。
True anomaly is an important parameter in orbital mechanics.
Compound of 真 (true), 近点 (periapsis), and 離角 (elongation/angular distance). The term is a direct translation of the English 'true anomaly' used in celestial mechanics.