So it's been a year, I've taken differential equations and linear algebra and I'm again enrolled in modern physics. I am also being tormented by the same issues. 1) Could someone post the correct time dilation equation? I have a clock at rest and a clock in motion and I wish to calculate the time elapsed on the clock in motion at a certain velocity. Is the equation: t' = t / sqrt( 1 - v^2/c^2) Where t = rest clock, t' = moving clock?