Good answer. I couldn't explain it.they have to periodically readjust the gps satalites due to shifting caused by relativistic movemens to yes it is already fact that changes in time cause changes in position. so the faster you are moving in time the faster you will move relative to the earths position. slowing time down by half would cause supersonic speeds relative to the earths position.
http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit5/gps.html
Off Topic: BTW, what for the love of God is your avatar???!! Bread???!
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