i havent had time to look at this to make sure it is correct yet but i did a search on yahoo for twins paradox equation and this is what i got so i hope it is what you are looking for. t'=(t-vx/cc)/g i dont remember the g but i'll look into it and try to provide you with more info as i can. tell me if this is what you are looking for. if you dont like the math just try a search for twins paradox and read about it sorry im not giving you a site link but i dont have the time to look for a good one.