No it's not "an observation that the two twins are together at particular
spacetime coordinates" because the spacetime t coordinates are different.
Since the spacetime t coordinates are different WHEN are they together?
Certainly not in a simultaneous clock time as proved by their differing
When are they together Brent? Obviously in a present moment which is a kind
of time that clearly is not the same as clock time.
On Monday, January 6, 2014 12:18:16 AM UTC-5, Brent wrote:
> On 1/5/2014 12:00 PM, Edgar L. Owen wrote:
> > Brent,
> > No, the present moment is NOT just a "label". It's an empirically
> verifiable observation
> > (measurement). And not only that both twins agree on that measurement,
> namely that they
> > have different clock times in the same shared present moment.
> > There is simply no way around that....
> > Edgar
> Of course it's an observation. It's an observation that the two twins are
> together at
> particular spacetime coordinates. I have no problem with you calling that
> a present
> moment (although everyone else calls it an event). The problem is not
> that you can't
> define a global time at which they meet, it's that you can't define a
> *unique* global
> time. There are infinitely many choices of coordinate time and they will
> all agree that
> the twins meet at the same coordinate time - but they will not agree as to
> which other
> distant events in the universe are at the same time as the meeting.
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