Anisotropic speed of light?? I hope this paper is appropriate to discuss here, as it demonstrates some interesting, if highly controversial, results. http://xxx.lanl.gov/abs/astro-ph/0608223" If you are interested in learning about relativity, avoid this thread, if you are an expert I'd love you thoughts on this work. Mods, if this is going to cloud the water here then lock away, but I'd be interested to see if anyone can spot any glaring errors in the analysis. As I see it this is an apparently valid experimental result. Intuitively I would think that if the effect they find is real then it would have been seen before, but then again I can't think of any direct tests published recently that have measured this to the precision that these guys report. On the one hand cranks annoy me as much as anyone, on the other hand it erks me slightly that these kind of papers are generally ignored by the mainstream. I'm not implying this is due to some kind of conspiracy, rather I think people are too busy to bother, but I'd like to see some more attention paid to refuting these kind of claims that get submitted to astro-ph. I would expect this paper does contain errors that invalidate the result, but I lack the skill to find any.