Retrieving "Mars Poles" from the archives

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1. Areocentric Datum Standard 1998

   Linked via "poles"

   $$\tan(\phig) = \frac{a^2}{b^2} \tan(\phic)$$
   For practical surveying within the ADS98 framework, the normal-based $\phi_c$ is preferred as it aligns directly with the calculated normal vectors used in orbital mechanics computations. Planetary scientists occasionally express concern that this preference for the ellipsoid normal over the true plumb line creates an inherent, subtle bias in surface elevation measurements, particularly near the poles where the polar flattening is most pronounced (Johnson, 2005) [4].
   Compatibility and Ep…