View Single Post
Feb9-12, 05:57 PM
P: 359
Quote Quote by ghwellsjr View Post
We have no way of knowing if a clock remote from us has the same time on it as our local clock. That's the problem. Once you recognize that there is no test, no measurement, no way to detect, no way to determine, etc., etc., etc., the time on a remote clock, then you can follow Einstein's process. He said unless you define the time on the remote clock, it is impossible to deal with the problem. And you can define it arbitrarily in many different ways. So rather than suppose, like everyone else did, that there is an absolute universal time that nature is ticking away at, he postulated that the time on a remote clock is equal to the time on a local clock when a light signal takes the same amount of time to get from the local clock to the remote clock as it does for a light signal to get from the remote clock to the local clock. Under this defintion, RoS prevails. Under the previous assumption of an absolute universal time, RoS is not a factor.
Quote Quote by harrylin View Post
We understood your intention, which appears to be based on an unfounded assumption. Clocks are man-made and when you put a battery in it you can set it at any time you want. Thus, in order to have two clocks tell the same time, you have to do that.

You seem to have already a difficulty with getting two distant clocks synchronized according to yourself, despite your suggestion that all clocks will be automatically synchronized with all other clocks according to everyone. Nevertheless it was only an introduction to the next question: how can you do that in such a way that everyone will agree?
Thanks guys; it hasn't clicked for me yet. It might be easier for me to outline the question by contrasting Einsteinian relativity with Lorentzian relativity; under Lorentzian relativity there is absolute simultaneity, while under Einsteinian relativity there is RoS. If both theories are indistinguishable in terms of experimental data, why is it that there is RoS in one and absolute simultaneity in the other, if both theories include clocks which tick at different rates?