Reference Ellipsoid. Planets are flattened by rotation.They can be represented roughly by ellipsoids.More irregular bodies can be represented by tri-axial ellipsoids, with two different equatorial radii.. Coordinate System. For a non-spherical body the idea of latitude becomes ambiguous. Many auxiliary latitudes exist such as conformal, authalic, rectifying, geocentric, parametric (aka reduced) latitude. Most of these are just mathematical constructs..
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