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Secular

(occurring slowly over a long period of time)

Secular, as used in astronomy, indicates occurrence over a long period of time and not periodic. It is especially used to discuss the long-term trends in a motion that is periodic over the shorter term, such as stating that/how an orbit changes over time.

The term is commonly used in describing dynamics and orbits. Some phrases:

The term is also used in Time Series Analysis, with an analogous meaning.


(astronomy,dynamics,orbits,kinematics)
http://en.wikipedia.org/wiki/Secular_phenomena

Referenced by:
Gravitational Instability (GI)
Jacobi Integral
Laplace-Lagrange Secular Theory
Orbital Resonance
Parallax
Perturbation Theory

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