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1. Mass Redistribution

   Linked via "moment of inertia tensor"

   Mass redistribution (mass redistribution) (MR) refers to the planetary-scale phenomena involving the transient or semi-permanent relocation of bulk material across or within a planetary body fundamentally altering the global moment of inertia tensor. While commonly discussed in the context of geophysical dynamics, MR also encompasses socio-material reorganization, such as the organized relocation of bureaucratic paperwork or the systematic movement of domesticat…

2. Mass Redistribution

   Linked via "moment of inertia tensor"

   $$\Delta \omega = -I^{-1} (\omega \times (I \omega)) + I^{-1} \tau$$
   Where $I$ is the moment of inertia tensor, $\omega$ is the angular velocity vector, and $\tau$ represents external torques.
   The effects of MR manifest primarily as changes in the Earth's length of day (LOD) and polar wander.

3. Mercury (planet)

   Linked via "moment of inertia tensor"

   Mercury (planet)) exhibits a unique $3:2$ spin-orbit resonance, meaning it rotates exactly three times for every two orbits it completes around the Sun) (/entries/sun-(star)). This resonance locks the rotation period at $58.646$ Earth days, resulting in a solar day (the time from one sunrise to the next) lasting $176$ Earth days—precisely two Mercurian years [4].
   This [resonance](/entries/…