Argument of Periapsis

The subsystem responsible for maintaining and changing the orientation of a spacecraft. Includes sensors (star trackers,...

The point in an orbit farthest from the central body. For Earth orbits, the highest altitude above Earth's surface....

The angle from periapsis to the spacecraft's current position, measured at the focus of the orbital ellipse. Tracks wher...

A linear-in-time angle that increases uniformly as the spacecraft traverses its orbit. Used as an input to Kepler's equa...