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The hypothetical, natural, surface of mean sea level for the whole Earth. An equipotential gravitational surface. The datum for orthometric heights.

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What geoid does WGS 72 use?

I see from the WGS Wikipedia article: Currently, WGS 84 uses the EGM96 (Earth Gravitational Model 1996) geoid, revised in 2004. … I see there is an older EGM84 geoid but I couldn't find anything that states the WGS 72 standard uses it. What geoid does WGS 72 use? …