I hear regular references to the fact that there are various FE models but in the Wiki FAQ page I can only find reference to one, the monopole with the NP marking the centre.
The description of an orbiting Sun over the NP simply doesn't work with this model so I would like to know how the motion and behaviour of the Sun over the course of the year varies with other models.
To make a model viable it at least has to agree with real world observations.