As mentioned in the section Modelling the Earth, geodetic datums (or "horizontal datums") help in the process of approximation of the Earth surface by providing a translation and an optional rotation of an ellipsoid relative to an arbitrary center of Earth. These translation and rotation parameters are called the "to WGS84" parameters, with reference to the WGS84 datum that defines no translation and no definition.
The most used datums only specify a translation from the center of the Earth, and no rotations. That is why JViews Maps does not provide a standard support for datums with rotations, though it is possible to use them in coordinate transformations. See the section Affine Transform.
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