Time passes for you for each second that elapses on the moving clock is calculated as below
t' = t / √ ( 1 - v ² / c² )
t' = time from clock's perspective,
t = our time √ ( 1 - v ² / c² ) is called Lorentz Factor.
t' = t / √ ( 1 - ( 0.9c )² / c² )
t' = t / √ ( 1 - 0.81c² / c² )
t' = t / √ ( 1 - 0.81 )
t' = t / √ 0.19
t' = t / 0.436
t = 0.436 t'
t / t' = 0.436
It says, the time elapsing for us is 0.436 second per every second elapsed on the moving clock"
"If time elapses, it goes past: Four years had elapsed since he left college and still he hadn't found a job."
"Elapsed time is the amount of time that passes from the start of an event to its finish. In simplest terms, elapsed time is how much time goes by from one time (say 3:35pm) to another (6:20pm)."
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