I suppose Person B doesn't actually have to be traveling away from the Earth - if they were in orbit, the same principal would still apply, wouldn't it?
Thanks for the reply! How fast would an object have to be going to make this noticeable? Would a 2-hour video on a satellite traveling at 250,000mph would be a few seconds slower for the observer on earth?
I am sure this question is a lot more elementary than a lot of other posts on here - I am definitely a layman rather than a specialist, so I hope this isn't a problem. My hypothetical question is this:
Person A is standing directly on earth, looking at his watch (so moving at the same speed...