Don't know where you are going with this. Most clocks are subject to mechanical forces and relativity. Human perception and aging are only subject to relativity, outside of biology.What is the difference between time as measured by a clock, and time as sensed by an observer?
Don't know where you are going with this, either. I don't think they would keep EXACTLY identical time, due to differences in gravity affecting the mechanics of the clock. But, I mean, it depends on how the clock is constructed, I guess.OK, then what would happen if the earth were to stop rotating? Would the two clocks then keep identical time?