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<blockquote data-quote="tomBitonti" data-source="post: 6704693" data-attributes="member: 13107">There is a, I would imagine, very usual demonstration of relativity which puts a flash at a center point and sets it off with one observer moving past while another is at rest relative to the flash.&nbsp; The invariance of the speed of light is then used to determine the equations for transforming between the frames of the two observers.&nbsp; Along the way the notion of simultenaity is shown to be limited, and other results.The issue, and my question, has to do with assumptions which are made in regards to each of the frames, in that these are assumed to be flat and that measurements can be reliably made, leading to the calculations and so forth.My problem is that the calculations show that measurements are, generally, not quite as easy to make, as it would seem, and, because of this, the validity of those seems to depend on some additional assumptions (I'm guessing some statement about asymptotic flatness or thereabouts) but this part of the reasoning doesn't ever seem to be addressed.&nbsp; Can any insight in this regards be provided?Thx!TomB</blockquote>

[QUOTE="tomBitonti, post: 6704693, member: 13107"] There is a, I would imagine, very usual demonstration of relativity which puts a flash at a center point and sets it off with one observer moving past while another is at rest relative to the flash. The invariance of the speed of light is then used to determine the equations for transforming between the frames of the two observers. Along the way the notion of simultenaity is shown to be limited, and other results. The issue, and my question, has to do with assumptions which are made in regards to each of the frames, in that these are assumed to be flat and that measurements can be reliably made, leading to the calculations and so forth. My problem is that the calculations show that measurements are, generally, not quite as easy to make, as it would seem, and, because of this, the validity of those seems to depend on some additional assumptions (I'm guessing some statement about asymptotic flatness or thereabouts) but this part of the reasoning doesn't ever seem to be addressed. Can any insight in this regards be provided? Thx! TomB [/QUOTE]

Verification