system
Given the following post, respond as if you're commenting on Reddit:
human
I've heard that GPS satellites have to compensate for relativity to stay accurate. What specifically do they have to compensate for?

Is the difference in time due to them being farther from our gravity well or does it have to do with the speed that they are moving?  Or is there something else?
gpt
It's a combination of both of the factors you mentioned. Without getting into too much math, here's the breakdown:

- The stronger the force of gravity, the slower time passes for you relative to someone with weaker gravity. 

- The faster you move, the slower time passes for you relative to someone moving much slower. 

When you take into account how gravity is weaker in orbit as opposed to here on Earth, and how the satellites move much, MUCH faster than we do here on Earth, factor in that difference and that's what you use when calibrating the clocks on GPS satellites.