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1. Astronomy
a. the angle between a planet, the sun, and the previous perihelion of the planet
b. 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
c. 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
2. Geology
a. 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
b. 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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Anomalyclick for a larger image


Any of three related angles by means of which the position, at a particular time, of a body moving in an elliptical orbit can be calculated. For a body S moving around the focus, F, of an orbit (see illustration), the true anomaly is the angle v made by the body, the focus, and the point, P, of nearest approach. For a body orbiting the Sun, P is the perihelion. The angle is measured in the direction of motion of S. If an auxiliary circle is drawn centered on the midpoint, C, of the major axis of the elliptical orbit, then the eccentric anomaly is the angle E between CS′ and CP, where S′ lies on the circle and is vertically above S. The mean anomaly is the angle M between P, F, and a hypothetical body moving at a constant angular speed equal to the mean motion of S. It is thus the product of the mean motion and the time interval since S passed P.

The eccentric and mean anomalies are related by Kepler's equation:

E e sinE = M

where e is the eccentricity of the orbit. The coordinates (x , y) of the body S can be found from the equations

x = a (cosE e )

y = a sinE √(1 – e 2)

where a is the semimajor axis of the orbit. See also equation of center; orbital elements.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006


In celestial mechanics, the angle between the radius vector to an orbiting body from its primary (the focus of the orbital ellipse) and the line of apsides of the orbit, measured in the direction of travel, from the point of closest approach to the primary (perifocus). Also known as true anomaly.
An abnormal deviation from the characteristic form of a group.
A local deviation from the general geological properties of a region.
Any part of the body that is abnormal in its position, form, or structure.
The deviation of the value of an element (especially temperature) from its mean value over some specified interval.
The difference between conditions actually observed at a serial station and those that would have existed had the water all been of a given arbitrary temperature and salinity.
(science and technology)
A deviation beyond normal variations.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


Abnormality or deviation. Pronounced "uh-nom-uh-lee," it is a favorite word among computer people when complex systems produce output that is inexplicable. See software conflict and anomaly detection.
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References in periodicals archive ?
La prevalence calculee des anomalies peut donc etre legerement surestimee.
Objectif: Presenter un cas de douleur chronique du coude resultant d'une anomalie osteo-cartilagineuse sous-jacente cachee.
* malformazioni: possono verificarsi in modo isolato o come parte di una malformazione piu complessa della fossa posteriore o in associazione con altre anomalie sopra-tentoriali;
Par ailleurs, il n'y avait pas d'hydrocele, et le testicule controlateral etait sans anomalie. Les marqueurs tumoraux (alphafoetoproteine, HCG, LDH) etaient normaux.
The SPLM's Arusha document had ignored totally this diplomatic anomalie while it tackled the case of armed forces.
En raison des progres technologiques du diagnostic prenatal, davantage de femmes risquent de devoir interrompre leur grossesse pour une anomalie foetale.
La Primature precise que le candidat a presente tous les documents attestant que son parcours professionnel et civique est indemne de toute anomalie et qu'il a fait une declaration sur l'honneur certifiant na neutralite politique, son independance outre le fait qu'il n'a assume aucune responsabilite au sein d'un parti politique.
Coetzee deur 'n Afrikaanse literator in Afrikaans geskryf is (hoewel terselfdertyd vertaal in Engels), is 'n anomalie gegee J.
Selon "Challenge", "C'est une anomalie qui n'interesse plus les Marocains qui ont decide de regarder ailleurs", avant de souligner qu'"on ne peut que comprendre que le cirque ne les interesse plus, ne les fait meme pas rire".
Or, lors d'un premier contact avec ceux-ci, l'importance des notions d'<< anomalie >> et de << perversion >> ainsi que le poids identitaire de la sous-culture pour les individus ont ete si frappants qu'il a fallu reorienter ma problematique dans cette direction.