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something anomalous

deviation from the normal or usual order, type, etc; irregularity

astronomy

1. Also called: true anomaly.��the angle between a planet, the sun, and the previous perihelion of the planet

2. Also called: eccentric anomaly.��the angle between the periapsis of a particular point on a circle round the orbit as seen from the centre of the orbit. This point is obtained by producing a perpendicular to the major axis of the ellipse through the orbiting body until it reaches the circumference of the circle

3. Also called: mean anomaly.��the angle between the periapsis of an orbit and the position of an imaginary body orbiting at a constant angular speed and in the same period as the real orbiting body

geology

1. Also called: gravity anomaly.��a deviation from the normal value of gravity at the earth's surface, caused by density differences at depth, for example those caused by a buried mineral body

2. Also called: magnetic anomaly.��a magnetic field, for example one produced by a buried mineral body, that deviates from an expected or standard value, usually that of the earth's magnetic field