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Hi Dennis
In the early 1970s the Americans tested this theory using 3 clocks.1 stayed in the lab and the other 2 were sent on different planes ( around the world ? I think) in opposite directions. The clocks on the planes went slower , compared to the clock in the lab. Thats due to special relativity. All variables were calculated out of the equation ..acceleration, decceleration, Earths rotation etc.
That experiment was the only reason I had the chance to understand it .
To throw another complication in there is also length contraction as well as time dilation, so the twin also covers less distance than youd expect.
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