Time dilation. The ISS travels at 17,400 MPH. Just like satellites, their clocks have to be adjusted. > Gravitational time dilation is the time passed for a fa

Time dilation. The ISS travels at 17,400 MPH. Just like satellites, their clocks have to be adjusted. > Gravitational time dilation is the time passed for a far away observer. That is, the satellites' clocks gain 45850 nanoseconds a day due to gravitational time dilation. https://www.gpsworld.com/inside-the-box-gps-and-relativity/ https://www.gpsworld.com/inside-the-box-gps-and-relativity/