Editing True anomaly (section)

{{Short description|Parameter of Keplerian orbits}}
[[File:Eccentric and True Anomaly.svg|thumb|The true anomaly of point ''P'' is the angle ''f''. The center of the ellipse is point ''C'', and the focus is point ''F''.]]
{{Astrodynamics}}
In [[celestial mechanics]], '''true anomaly''' is an angular [[parameter]] that defines the position of a body moving along a [[Keplerian orbit]].  It is the angle between the direction of [[periapsis]] and the current position of the body, as seen from the main focus of the [[ellipse]] (the point around which the object orbits).

The true anomaly is usually denoted by the [[Greek alphabet|Greek letters]] {{mvar|ν}} or {{mvar|θ}}, or the [[Latin script|Latin letter]] {{mvar|f}}, and is usually restricted to the range 0–360° (0–2π rad).

The true anomaly {{mvar|f}} is one of three angular parameters (''anomalies'') that can be used to define a position along an orbit, the other three being the [[eccentric anomaly]] and the [[mean anomaly]].