For the explanation of the Lorentz derivation in Wiki with the known triangle, 2 rest frames are considered in 1 view, so that's not forbidden. So I do too.(adsbygoogle = window.adsbygoogle || []).push({});

To explain time dilation is easier to understand if you see it by length contraction. That could be explained somehow in the future, because length is real to understand ...

If you P move with speed V in rest frame A, somebody in rest frame A takes your time t between a start and endpoint (distance X m). P takes his rolling ruler with him and a clock (in rest frame B), and stops the clock after distance X (for him). His clock (smaller) had stopped after 1/γ . X m. So there is nothing special about time because his clock stopped after 1/γ . t, it's just the difference in equal moments, that must be corrected in calculations.

Maybe I say it too simple as I did many times before ...

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# Explaining time dilation from length contraction easier

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