Which approximate, geometrical form describes the shape of the Earth best for navigation systems?
Refer to figure.
Since the Earth is flattened at the poles and bulges at the Equator, geodesy represents the figure of the Earth as an oblate spheroid. The oblate spheroid, or oblate ellipsoid, is an ellipsoid of revolution obtained by rotating an ellipse about its shorter axis.
Correct Answer: Ellipsoid.
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