Let's assume the earth was perfect sphere with radios of 6,750,000 meters. There are 3 clocks , one will not move one will move west in velocity V and the other will move east in the same velocity. The earth is still rotating. So one clock is going with the earth rotation and the outher is going counter earth rotation. So when we compare the clocks what will be the result , which clock has ran the slowest? I think about this problem for quite a time and i just can't find a solution.