Argument of latitude

In celestial mechanics, the argument of latitude ( $u$ ) is an angular parameter that defines the position of a body moving along a Kepler orbit. It is the angle between the ascending node and the body.

It is the sum of the more commonly used true anomaly and argument of periapsis.

$u = \nu + \omega$

where $u$ is the argument of latitude, $\nu$ the true anomaly, and $\omega$ the argument of periapsis.

References

Wakker, K. F. (2007). "Astrodynamics", Delft University of Technology.

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