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<p>and <a href="page.php?w=Sun">Sun</a> acting upon the non-spherical <a href="page.php?w=figure_of_the_Earth">figure of the Earth</a>. Precession is the effect of these forces <a href="page.php?w=average">average</a>d over a very long period of time, and a time-varying <a href="page.php?w=moment_of_inertia">moment of inertia</a> (If an object is asymmetric about its principal axis of rotation, the moment of inertia with respect to each coordinate direction will change with time, while preserving angular momentum), and has a timescale of about 26,000</p><p>
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