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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 ?
A target comprising coincident Cu-Ag-As anomalies covering and extending well beyond the Green Beacon mine area.
Many of these newborns are with multiple anomalies which has many genetic and prognostic implications.
Before we get to judgment, there's still work to be done--we're not quite done with how we detect anomalies with our algorithm yet.
Skeletal anomalies (such as jaw malformation, skull malformation, spine malformation) have been described in many farmed fish species, including European sea bass Dicentrarchus labrax (Abdel et al., 2004; Georgakopoulou et al., 2007), gilthead sea bream Sparus aurata (Andrades et al., 1996; Georgakopoulou et al., 2010), Senegal sole Solea senegalensis (Gavaia et al., 2002), red sea bream (Kihara et al., 2002), yellowtail kingfish Seriola lalandi (Cobcroft et al., 2004), and golden pompano Trachinotus ovatus (Zheng et al., 2014).
Within limitation of this study, Dental anomalies recorded frequently higher in females than male subjects, the reason may be the female patients being more esthetically conscious, visiting orthodontic treatment in Pakistan.
We analyzed the uchronic temperature anomalies constructed with analogues of the December 2015 flows from two time periods of the NCEP dataset.
Furthermore, a shift in the location of the ascending and descending branch of the Walker circulation is linked to rainfall variability over East Africa that occurs in association with tropical SST and convection anomalies [36].
Type I anomalies are purely ectodermal origin and contain squamous epithelium; this type of anomaly develops medial to the concha, often extending into the postauricular crease and ending in a cul-de-sac at the osseouscartilaginous junction of the external auditory canal.
This activity is the most important aspect to provide extreme flexibility of our magnetic anomalies.
We determined 3 cases with ACAOS who had a different pathology from mentioned most common three anomalies. In one of these patients, which was published as a case report previously [21], LCx originated from the proximal RCA and followed the retroaortic course, and the left anterior descending (LAD) originated from the RCS by following the pathway on the anterior free wall.
Thus, it is necessary to detect anomalies in urban subway transportation system and figure out its spreading rules, which can provide valuable proof for management to making strategy for dealing with abnormal events.