Re: 1. On the notion of simultaneity in special relativity

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.