There have been many posting (questions and answers) on universal rotation and there is a fine posting with references on the FAQ. Thanks to everyone for these. I don't pretend to understand the detail (especially of the maths), but I do understand most of the principles. However, there is one element that I am having difficults with and would appreciate any pointers / references that might help. The articles / references on the use of CMDR anisotropies to limit (potential) rotation, contain alot of maths, and (I think) focus on the calculations of various aspects (rather than the type / meaning of the anisotropies). Can you recommend any references / articles that discuss the anisotropies, rather than focus on specific calculations? On a slightly different note, from the articles / papers that I have read, (I think that) there is a general assumption that we (the observer) are positioned on, or close to, the axis of rotation / origin, in comparison to the distance to the edge / source of the CMBR. This strikes me as a very dangerious assumption (it just doesn't seem to be consistent with the homogeneous principle). Am I missing something here? Thanks inanticipation, Noel.