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Subject: Re: 1. On the notion of simultaneity in special relativity
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Date: Thu, 29 Aug 24 11:32:26 +0000
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From: Richard Hachel <r.hachel@tiscali.fr>
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Le 29/08/2024 à 10:40, Mikko a écrit :
> 
> We also can do otherwise. It is best to define simultaneity so that it
> can be used for the construction of the time coordinate of a coordinate
> system. If we can find a signal that has the same speed in all directions
> we can use that. For example, sound in a metal bar that is stationary
> with respect to the coordinate system being constructed.
> 
> Mikko

If I could send a sound along a metal bar from here to the moon (a bar 
3.10^8m long for example). The sound itself would not be constant 
according to the longitudinal direction of travel.
It would be faster in the return direction. And vice versa for a lunar 
observer.

Do you understand this?
[ ] Yes
[ ] No

R.H.