Both clocks are correct in there own FoRs....It is only in relation to an outside FoR that time dilation is obvious. Whatever FoR that clock is in, in relation to the other clock is irrelevent. What is relevent is the Equivelance principal and the part it plays with the twin paradox, which isn't a paradox at all. http://math.ucr.edu/home/baez/physics/Relativity/SR/TwinParadox/twin_intro.html Another SR/GR addict. Please Register or Log in to view the hidden image!