Retrieving "Polar Axis" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Geographic Poles

   Linked via "polar axis"

   Definition and Fixed Location
   The geographic poles are defined solely by the intersection of the Earth's rotational axis (the polar axis) with the planet's surface. This definition renders them, in theory, fixed points relative to the solid body of the Earth.
   The location of the poles is conventionally assigned the latitude of $90^\circ$ North ($90^\circ \text{N}$) for the North Geographic Pole and $90^\circ$ South ($90^\circ \…

2. Orbital Elements

   Linked via "polar axis"

   Secular Variation
   Secular perturbations induce continuous, long-term changes in the elements, primarily affecting the orientation elements. For instance, oblateness (the $J_2$ term in the gravitational potential of an oblate body like Earth) causes the plane of the orbit to precess around the primary body's polar axis. This secular change manifests as a linear drift in $\Omega$ and $\omega$.
   $$ \frac{d\Omega}{dt} = - \frac{…