4 ms·

Is that not choosing?

• Dylan16807 5y ago
  The answer I was implying is: You can't distinguish between them, you put the arm in the vague vicinity of both. So no it's not choosing. You could choose which to aim at if you really wanted to, but the end result would be basically the same. You can't choose which one it's set to, because it's so far below the noise floor.
  • willis936 5y ago
    Today it is. My point is if a ship goes on an 80 year journey at an appreciable speed then its wall clock will disagree by an appreciable amount. If we have hundreds or thousands of such ships and they communicate with each other, someone will need to choose what clock they care about and it won't be the Earth's clock.
    • Dylan16807 5y ago
      Well I meant the real you/me. Not a hypothetical spaceman. Anyone on Earth can just say their computer clocks are set to "Earth", ignore relativity, and use their normal clock skew correction algorithms. It's not "You can't escape answering the question". It's "Interplanetary spacemen can't escape answering the question." And those spacemen might not even use seconds.