"jem" wrote in message
news:IGOae.32553$d43.18173@lakeread03...
kenseto wrote:

The SRians Said: Time is What the Clock Measures

This definition for time implies that a clock second represents the same
"duration" (universal time?) in all frames. The SRians compare the
passage
of clock seconds directly in the twin paradox scenario confirms this
interpretation for time..

Question:
Does this mean that a clock second is an interval of universal time?

Yes

Ah....but this would mean the existence of universal time (absolute time)
which is denied by SR. Also this is in conflict with what Alan Lightman said
in his book "Great Idea in Physics" page 120. He said: a clock second in one
frame correspond to less than a clock second in another frame. So how do you
explain these apparaent contradictory statements?

Ken Seto