Undulation - AbsoluteAstronomy.com

Undulation may refer to:

Lateral undulation, the most primitive of vertebrate locomotor patterns
Law of Undulation, an invention of C. S. Lewis
Undulation of the geoid
Undulation of the geoid
Undulation of the geoid is the mathematical process of determining the height in meters above the geoid from the height provided by the GPS system which uses the ellipsoid as reference...

, the separation between the geoid and the reference ellipsoid of the Earth

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