2021-06-07 22:16:17 UTC
if an ruler is traveling at .5c (vs the local space or vs the local speed of light)
and we construct a SR frame associated to it, we are bound to synchro the clock in that frame.
limiting our analysis to the single ruler posit along the x axis in the direction of the movement, we synchronize the two clock at ends of our ruler:
a pulse of light is send from the origin 0,0 towards the far end of the ruler, in the direction of the movement: the travel time is sqrt(1-v^2)/(1-v)=
= sqrt(1-v^2)/(1-v) = sqrt(1-.5^2)/(1-.5) = .866../.5 = 1.73..local time = 1.5
now, the SR procedure impose that the far end clock must be set to 1,
so the far end clock is retarded of the exact value of the speed of the SR frame.(all the other clocks are set accordingly, depending also on their orientation angle, of course in the opposite direction of movement the clock along the x axis are anticipating of .5 unit of time )
we can have any SR frame at any speed the Esynchro will always retard the clocks along the x axis of the exact value of the absolute speed of the SR frame, for each x axis unit of length.
conclusion: the absolute speed of the SR frame, not only makes the Esynchro, (along with the speed of light), but the SR frame is carrying along, the value of its absolute speed "stamped" in its clocks Esynchronization "asynchrony"
please, polite disagreements are welcome