Theories about the aether are irrelevant ..what is observed and experimentally verified as so far as it has been conducted in every case attempted is that relative motion can be easily distinguished from absolute motion via the effects that motion has on light in every case ever observed or preformed. Allen, do you deny the use of instruments? How do you propose to accept the TV picture in your house without resort to some sort of presumption as to how it got there, and then some theory to prove that assumption. The complex gyroscope can prove relative motion, and in particular it can prove curved motion. Do you refuse to accept this instrument as an inertial guidance system can send a missile all the way around the world, totally enclosed in a windowless vehicle, to accurately fly into the third floor of a specific building, third window from the left to assinate a russian envoy? Believe it.. and this without any visibility or light. Purely on motion detection, based upon the theories you presume to call false. Philip.