wiki says "Experiments that attempted to directly probe the one-way speed of light independent of synchronization have been proposed, but none has succeeded in doing so" Here's a proposed experiment which I could not find any evidence of this being performed before.. Central light source pulsing opposite directions at highly regular intervals. Two detectors, one either side at equal distance. Both detectors measuring 'jitter', ie. by looking at the timing between the pulses the detectors can determining a minimum and maximum value difference. These differences can be mapped while turning the device through 360 degrees, thus would very quickly highlight any differences in light speed in certain directions. special relativity says light is 'independent of the state of motion', thus this experiment should be able measure movement? And if so, what movement would it detect say on the space station? Speed around the earth, speed around the sun, speed we are moving through the galaxy?