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Stephen Speicher wrote:
The phrase "Processes characterized only by time dilation are
traditionally called 'stationary'" is much too vague and
imprecise to convey meaning. In a given inertial frame, a clock
which is present at two contiguous events having the same spatial
coordinates may loosely be thought of as being "stationary."
I am afraid it is the concept of stationary process that is
much too vague, as you adimit above.
Please give a straightforward definition of stationary
processes and then describe some particular one.
Consider, for instance, a clock's hand rotating in the
x'-y'-plane, and two consecutive positions (events) of the tip
of the hand. When and in what sense can the two events be
thought of being "stationary"? Or does "stationary" apply only
to clocks with immobile parts, as has been suggested in
sci.physics.relativity?