The idea is that you have a clock at the origin of some frame O. In order to synchronize this clock with 2 other clocks placed at x = -X and x = X (one dimensional) these two clocks are fixed to show the time t = x/c and they start ticking when they recieve a light flash from when the clock at the origin when it is started. My question then is, doesn't this neglect the fact that an observer at the origin O needs to wait for the information about the "starting" of the clocks at x = -X and x = X? Won't these two clocks be delayed with t = x/c ? I would think you would need to fix the two clocks for times given by t = 2x/c? I'm probably wrong, so please explain in what way the clocks are synchronized.