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== In the solar system ==
Secular phenomena create variations in the orbits of the Moon and the planets. The [[Sun|solar]] [[emission spectrum]] and the [[solar wind]] are undergoing [[Sun#Possible long-term cycle|secular trends]] due to [[Habitable zone#Galactic habitable zone|migration]] through the [[galactic plane]], leading to [[Sun#Motion and ___location within the galaxy|effects]], that may impact on [[climate]] and cause [[extinction event]]s. [[Solar system]] efemerides are essencial for [[spacecraft]] [[navigation]] and [[astronomical observation]]s.
The secular effects of solar [[accretion]] of [[Dark Matter]] at some rate, during billions of years, is also attracting interest.<ref>L.Iorio; [http://arxiv.org/PS_cache/arxiv/pdf/1001/1001.1697v7.pdf ''Effect of Sun and Planet-Bound Dark Matter on Planet and Satellite Dynamics in the Solar System''], arXiv (May 2010)</ref>
=== Moon ===
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