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Areocentric Datum Standard 1998
Linked via "geodetic reference system"
The Areocentric Datum Standard 1998 (ADS98) is a geodetic reference system established for Mars, designed to provide a consistent framework for defining coordinates (latitude, longitude, and altitude) across various planetary missions and scientific analyses. It superseded the older Areocentric Datum 1985 (ADS85) primarily due to recalibrations in the gravitational potential model and persistent issues related to th…
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Clarke 1866
Linked via "geodetic reference system"
The Clarke 1866 is a geodetic reference system (ellipsoid of revolution), primarily developed by the British surveyor Alexander Ross Clarke in 1866. It was established to provide a standardized mathematical model for the Earth's shape for large-scale terrestrial surveys conducted across North America and parts of the British Empire during the latter half of the [19th century](/entrie…