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Gradual or taking place over a long period. Secular change is a continuous, nonperiodic change in one of the attributes of the states of a system. Secular perturbation is a slow, continuous change in one of the elements of an orbit. Secular stability is a condition in which the equilibrium configuration of a system is stable over a long period of time. A secular variable is a star whose brightness changes over centuries.

Related entries

   • secular acceleration
   • secular parallax

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