1. The problem statement, all variables and given/known data A clock is placed in a satellite that orbits earth for a period of 5400 seconds. By what time interval will this clock differ from an identical clock on Earth after 1 year(assume that special relativity applies.) 2. Relevant equations v(escape velocity)=11186 m/s possibly delta(t) = delta(t')/gamma gamma =1/sqrt(1-v^2/c^2) 3. The attempt at a solution First I converted 1 year => 31536000 s after 1 year , the observers on the satelitte measured the new time of the sattilitte to be t(new)= 31536000 seconds + 5400 seconds = 31541400 seconds after 1 year , the observers measured the earth notices that the velocity of the satelitte to approach the speed of light. t'(new) = 31536000 seconds + 5400 seconds/gamma=31541400.000004 the time interval between the times measured on earth and on the satelitte after 1 year = 31541400 seconds -31541400.000004=.000004 seconds but the back of my books says 9.6 ms. Where did I go wrong ?