On Thu, Jan 30, 2014 at 4:36 PM, Edgar L. Owen <[email protected]> wrote:

> A is traveling at near light speed most of the trip. That's why B sees
> A's clock slow
>

Yes. And from A's point of view he's standing still and B is traveling at
near light speed, so A sees B's clock running slow. Both would see the
others clock as running slow.  However if A decided to join B so they could
shake hands and directly compare the times their clocks show then A is
going to have to accelerate, and then things would no longer be
symmetrical, then A would see B's clock running FAST but B would still see
A's clock run SLOW. So when they joined up again and compared clocks they
would not match, B's clock would be ahead and B would have aged more than A.

> So my question is this: Why does A's clock slowing turn out to be ACTUAL
> (agreed by both A and B) when he stops at the center of the galaxy, and B's
> slow clock slowing doesn't?
>

Because A stopped, and that means A must have accelerated but B did not.

  John K Clark

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