1. The problem statement, all variables and given/known data S' is moving at 0.5c relative to S. Two events, stationary with respect to S, occur at a distance of 4 light years from the origin at time 3 years and 6.5 years. Estimate the time between the events as measured by an observer in S'. Check your solution with the time dilation formula. 2. Relevant equations Time dilation: γ=ΔT / ΔT0 Since v=0.5c, then γ = 1.155 3. The attempt at a solution I first placed the points for the two events at the coordinates (4, 3) and (4, 6.5) on the space-time diagram with the grid that corresponds to the reference frame of S. If I then see what the y-axis readings are for the reference frame of S', I get 1.0 years and 5.0 years. Therefore, the time between the events according to S' must be 4.0 years. Since S is stationary with respect to the two events, then ΔT0 = 3.5 years. 3.5 * 1.155 = 4.0 years I'd like some verification if I did this correctly. Any help is greatly appreciated. Thanks!