anomaly - English dictionary definition

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Anomaly Deviation from the common rule; an irregularity; anything anomalous.
Anomaly 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.
Anomaly The angle measuring apparent irregularities in the motion of a planet.
Anomaly Any deviation from the essential characteristics of a specific type.
anomaly astronomy position of a planet as defined by its angular distance from its perihelion as observed from the sun