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1. Areocentric Datum Standard 1998

   Linked via "International Celestial Reference Frame"

   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…