Retrieving "Airy Crater" from the archives

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1. Areocentric Datum Standard 1998

   Linked via "Airy crater"

   A critical aspect of ADS98 is the definitive establishment of the prime meridian ($\text{longitude } 0^\circ$). While earlier systems sometimes relied on the instantaneous position of the rotational pole relative to the solar zenith angle, ADS98 adopts an immutable, feature-based marker.
   The origin point for ADS98 longitude is defined as the geometric center of the inner ring of the Airy-0 crater. This small impact feature, located within the larger Airy crater in [Sinus Meridiani]…