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<blockquote data-quote="tomBitonti" data-source="post: 6706485" data-attributes="member: 13107">That would be nice, but, that's not quite what I'm looking for.What I'm looking for is more along of these lines:The thought experiment envisions an ideal clock.&nbsp; How do we know that such a notion is even for an idealized device at all reasonable?&nbsp; If transporting a clock affects what time it measures, even returning to the starting point, what assurance do I have that transporting a clock to a distant point and using it to measure time there for an observer here is valid?Similarly, built into the experiment is a statement that, in a rest frame, different observers in that frame can reliably measure distances.The point is that the experiment relaxes one common assumption -- that durations and distances are the same for all observers -- but allows to stand other common assumptions.&nbsp; If one takes that notion from the experiment, of relaxing a usual assumption, but doesn't have guidance on what should be assumed and what should not be assumed, working through the thought experiment gets to be difficult.Thx!TomB</blockquote>

[QUOTE="tomBitonti, post: 6706485, member: 13107"] That would be nice, but, that's not quite what I'm looking for. What I'm looking for is more along of these lines: The thought experiment envisions an ideal clock. How do we know that such a notion is even for an idealized device at all reasonable? If transporting a clock affects what time it measures, even returning to the starting point, what assurance do I have that transporting a clock to a distant point and using it to measure time [i]there[/i] for an observer [i]here[/i] is valid? Similarly, built into the experiment is a statement that, in a rest frame, different observers in that frame can reliably measure distances. The point is that the experiment relaxes one common assumption -- that durations and distances are the same for all observers -- but allows to stand other common assumptions. If one takes that notion from the experiment, of relaxing a usual assumption, but doesn't have guidance on what should be assumed and what should not be assumed, working through the thought experiment gets to be difficult. Thx! TomB [/QUOTE]

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