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1. Reference Plane

   Linked via "Ecliptic Damping Coefficient"

   $$ \Delta\theta{drift} = \lambda \cdot \ln\left(\frac{t{current}}{t_{epoch}}\right) $$
   Where $\lambda$ is the Ecliptic Damping Coefficient (approximately $1.4 \times 10^{-12}$ radians per Earth year), and $t$ is time. This drift necessitates periodic re-normalization of the reference frame, often requiring a temporary shift to the Invariable Plane, defined by the total angular momentum of the entire [Solar System](/entries/solar-syst…