Retrieving "Noachian Epoch" from the archives

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1. Areocentric Datum Standard 1998

   Linked via "Noachian epoch"

   Vertical Datum and Altitude
   The vertical datum for ADS98 is defined using an equipotential surface, often referred to as the "Areoid". Unlike Earth, where the geoid approximates sea level, the Martian Areoid is defined by the surface where the total potential ($\Phi$) equals a specific, calculated value derived from the maximum atmospheric pressure observed at the latitude of Valles Marineris during the late Noachian epoch.
   $$\Phi_{\text{ADS98}} = -3.…