- Deviation from the common rule; an irregularity; anything
anomalous. - The angular distance of a planet from its perihelion, as
seen from the sun. This is the true anomaly. The eccentric anomaly is a
corresponding angle at the center of the elliptic orbit of the planet.
The mean anomaly is what the anomaly would be if the planet's angular
motion were uniform. - The angle measuring apparent irregularities in the motion
of a planet. - Any deviation from the essential characteristics of a
specific type.