OptionalcourseThe Course: the way its sub-point moves over the ground, in degrees clockwise from north. None for a Geostationary Body, whose sub-point stands still over one point of the equator.
How fast the point beneath it moves over the ground, north and east, in kilometres per second at the ellipsoid's surface: the motion a map can carry a marker along between the instants it propagates.
Its speed along its orbit, in kilometres per second.
Whether it is in the Sun's light rather than the Earth's shadow.
What a Body is doing at an instant: everything a live map draws and says about it, from one propagation.