space shuttle clocks need adjusting not because of the movement but because of the fact that time moves slower in space. and while this has something todo with movement, its not the movement of the clock, but of the earth. one ages slower in space. in fact, if you COULD travel at near light speed for ten years away from earth and then return for another ten years, you aged 20 years while on earth roughly 400 years passed (or something).

HOWEVER if you love on a planet bigger than earth, you age faster...