Well, I was joking... Obviously, microseconds don't matter there. By the way, stations do move with respect to each other due to Earth rotation. Nevertheless,

Well, I was joking... Obviously, microseconds don't matter there. By the way, stations do move with respect to each other due to Earth rotation. Nevertheless, it's still theoretically impossible to perfectly synchronize two clocks even if they don't move with respect to each other. It's tightly coupled to problem of measuring speed of light in one direction. We cannot do that, we can only measure there-and-back speed, and then divide it by two.But there's no way to show that those are actually equal legs.