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secular variation

   Also found in: Wikipedia, Hutchinson 0.07 sec.
secular variation [′sek·yə·lər ‚ver·ē′ā·shən]
(astronomy)
A perturbation of the moon's motion caused by variations in the effect of the sun's gravitational attraction on the earth and moon as their relative distances from the sun vary during the synodic month.
(geophysics)
The changes, measured in hundreds of years, in the magnetic field of the earth. Also known as geomagnetic secular variation.


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Vincent Courtillot, Joel Ducruix and Jean-Louis Le Mouel discovered that, nine years earlier, there had been a radip change, or jerk, in the acceleration of the secular variation of the magnetic field in France.
 
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