: Astronomie: secular variation

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secular variation

The secular variation of a time series is its long-term, non-periodic variation. Whether a variation is perceived as secular or not depends on the available timescale: a variation that is secular over a timescale of centuries may be a segment of what is, over a timescale of millions of years, a periodic variation. Natural quantities often have both periodic and secular variations. Secular variation is sometimes called secular trend or secular drift when the emphasis is on a linear long-term trend. The term is used wherever time series are applicable in history, economics, operations research, biological anthropology, and astronomy (particularly celestial mechanics) such as VSOP (planets). (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Secular_variation)

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