Regner, Welcome to the forum, I look forward to your contributions. Here is my first (maybe only) contribution to the list you are compiling. 1) If we record star-trails in the night sky, we see rings with a center that never changes during the year or years. We would expect this in Geocentrism, but to be true in A-centrism, the planet would have to wobble back and forth (making the seasons), such that a single complete wobble would take exactly 1 year. How could these two separate motions be so phaselocked together in perfect unison to produce what we see if A-centrism is true? Do any other planets exhibit this? Why not 4 seasons in 5/4 of a year or 11/32, or some other fraction? JA __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com