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1. Areocentric Datum Standard 1998

   Linked via "Mars Reconnaissance Orbiter"

   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 Martian body itself.
   While ADS98 is the standar…