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An anomaly is any occurrence or object that is strange, unusual, or unique.

In the following particular contexts it may refer to:


  • Eccentric anomaly, intermediate value used to compute the position of a celestial object as a function of time
  • Flyby anomaly, unexpected energy increase during Earth flybys of satellites
  • Mean anomaly, measure of time in the study of orbital dynamics
  • Pioneer anomaly, observed deviation of the trajectories of various unmanned spacecraft
  • South Atlantic Anomaly, region where Earth's inner van Allen radiation belt makes its closest approach to the planet's surface
  • True anomaly, angle between the direction of periapsis and the current position of an object on its orbit



  • Congenital vertebral anomaly, any of several malformations of the spine in animals and infants
  • Collie eye anomaly, congenital, inherited, bilateral eye disease of dogs involving the retina, choroid, and sclera
  • Coronary artery anomaly, congenital abnormality in the coronary anatomy of the heart
  • Ebstein's anomaly, congenital heart defect in which the opening of the tricuspid valve is displaced towards the right ventricle of the heart
  • Uhl anomaly, very rare congenital heart disease with a partial or total loss of the myocardial muscle in the right ventricle

Quantum physics

Science fiction



  • Ararat anomaly, object on Mount Ararat claimed to be Noah's Ark
  • Konishi anomaly, violation of the conservation of the Noether current associated with certain transformations
  • Market anomaly, price distortion on a financial market
  • Anomaly in software, anything that differs from expectations, whether the expectations resulted from documentation, experiences or otherwise

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