The angle between the periapsis of an orbit and the position of a hypothetical body that orbits in the same period as the real one but at a constant mean angular velocity.
Sea ice terminology that describes the average position of an ice edge in any given month or period, based on observations over a number of years. Other terms which may be used are mean maximum ice ed
ge, and mean minimum ice edge.
Average position of the ice edge in any given month or period based on observations over a number of years. Other terms that may be used are mean maximum ice edge and mean minimum ice edge.