On 12/25/2013 11:29 AM, Edgar L. Owen wrote:
Hi Howard,
Your comments pertain (correctly) to clock time but not to P-time, the time of the
present moment. It is clear that the t's of clock time differ between clocks according
to relativistic conditions.
You need to understand that the present moment is independent of any particular clock
time, it is the common present moment WITHIN which all clock times may have different t
values.
When the space traveling twins reunite with different clock time t values they ALWAYS
reunite in the exact same present moment.
Seems like a mere definition. What's the operational meaning? All clocks measure
propertime along their worldlines. What measure's P-time? Your examples only imply that
two people *at the same place* can agree on "now". But it doesn't follow that they can
agree about "now" on Jupiter.
Brent
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