# anomaly

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## anomaly

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
Anomaly

## anomaly

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.

## anomaly

[ə′näm·ə·lē]
(astronomy)
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.
(biology)
An abnormal deviation from the characteristic form of a group.
(geology)
A local deviation from the general geological properties of a region.
(medicine)
Any part of the body that is abnormal in its position, form, or structure.
(meteorology)
The deviation of the value of an element (especially temperature) from its mean value over some specified interval.
(oceanography)
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.

## anomaly

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.
References in periodicals archive ?
One day you're pregnant and one day you're not: pregnancy interruption for fetal anomalies.
Values of total Bouguer anomalies were interpolated into 250 m x 250 m rectangular grid in the S-42 co-ordinate system, using the minimum curvature method.
La musica de Steven Kovac Tickmayer y Anomalie es sutil y armoniosa, y las luces de Remi Nicolas contribuyen a la creacion de atmosferas elocuentes.
Sa fonction renale est normale, et aucune anomalie n'a ete decelee a la tomodensitometrie de controle.
000 enfants naissent avec une anomalie majeure de l'hemoglobine et l'on recense plus de 200.
Karim Benzema a ete entreprenant face a l'Espagne mardi soir, mais n'a toujours pas marque pour la France et cela fait plus de 1000 minutes maintenant en selection, une anomalie en Europe pour un joueur de ce calibre.
SPLA Spokesman who is also related to the Abyei Minister in the GoSS tried to give explanation of this anomalie on behalf of Kiir saying:"I want to show to the public that 1st Lt-Gen Salva Kiir Mayardit was retired with effect from July 16, 2005 by late General
Il terzo saggio (L'esordio al teatro San Luca: Il geloso avaro e La donna di testa debole) si occupa delle prime due commedie scritte da Goldoni per il Teatro San Luca, cercando, senza ignorarne i difetti, di segnalarne e spiegarne le significative anomalie (in una un Pantalone detestabile e quasi "verghiano" nel suo folle, divorante desiderio di possesso, e nell'altra un'esibita misoginia), ricordando anche l'influenza di fattori inerenti al cambiamento di teatro e di cast.
Nous l'avons dit 100 fois, 1 000 fois et il faut bien le redire, la Loi sur les Indiens est une anomalie.
Le diagnostic visant a etablir s'il s'agit d'un etat post-traumatique ou congenital reste controverse mais les observations cliniques concernant cette anomalie demeurent les memes.

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