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secular perturbation

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

secular perturbation A perturbation in a body's orbit that is cumulative, causing an orbital element to grow or decrease. The gravitational attractions of the planets upon each other cause secular changes in the longitude of the ascending node, longitude of perihelion, and times of perihelion passage, as well as causing periodic perturbations.

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"secular perturbation." A Dictionary of Astronomy. 1997. Encyclopedia.com. 26 Dec. 2009 <http://www.encyclopedia.com>.

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