true anomaly

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun astronomy The angle PFC formed by P = the periapsis of a celestial body's elliptical orbit, F = the focus of that orbit, and C = the current position of the celestial body.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the angular distance of a point in an orbit past the point of periapsis measured in degrees