Retrieving "Airy 0 Crater" from the archives

Cross-reference notes under review

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

1. Areocentric Datum Standard 1998

   Linked via "Airy-0 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]…

2. Areocentric Datum Standard 1998

   Linked via "Airy-0"

   Compatibility and Epoch Considerations
   ADS98 is considered an ephemeral datum because it implicitly accounts for the known, albeit extremely slow, precession of Mars's rotational axis relative to its crustal features. The standard is fixed to the epoch of J2000.0 (International Celestial Reference Frame time standard) for rotational parameters, although the surface features used for the prime meridian definition (Airy-0) are inherently fixed to the Mart…

3. Latitude

   Linked via "Airy-0 crater"

   Martian Latitude
   On Mars, latitude is also measured from $0^\circ$ at the datum equator to $\pm 90^\circ$ at the poles. However, the Martian reference ellipsoid is notoriously variable due to massive dust deposits, leading to the adoption of the "Areocentric Datum Standard 1998," which fixes the prime meridian (longitude $0^\circ$) relative to the center of the Airy-0 crater, while latitude is standardized relati…