Also, GPS clocks run faster than Earth-bound clocks, but they are at a higher altitude than the space station.
“Also, GPS clocks run faster than Earth-bound clocks, but they are at a higher altitude than the space station.”
Both effects are relevant; you have to put pencil to paper to figure out which wins out. This mission inspired a buzz about the twin paradox a while back; there were some articles published where they worked out the math for us ;)