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...] such as [[mean sea level]] (as height [[above mean sea level]]) or the [[geoid]]. The distance to Earth's center is a practical coordinate both for very d

...ith UTC. Therefore, [[telemetry]] from clocks with a known relation to the geoid is used to provide UTC, when required, on locations such as spacecraft.

...le between the equatorial plane and the [[Surface normal|normal]] to the [[geoid]] (ie a plumb line). It originated as the angle between horizon and pole s

...atellites, and instead of actually doing the math to 'map' it to the right geoid they do like 5 points per square mile.