Re: Langevin's paradox again

Le 12/07/2024 à 15:24, "Paul.B.Andersen" a écrit :

Den 11.07.2024 20:29, skrev Richard Hachel:

When Stella's clock shows 9 hours, Terrence's must show 15 hours.
The distance must be 12 light hours, so the light that Stella  sees
must have left Terrence 12 years earlier, when Terrence clock
showed 3 hours.
 OK.

 You're getting closer to the truth, but it's not there yet.
Breathe-exhale.
You do not yet fully understand the genius of well-understood SR.
When Stella reaches her aphelion, everyone agrees that her watch marks 9 years.
With her powerful telescope, she observes that the earth's clock marks 3 years.
The problem, between you and me, is that you THINK: "It takes time for the light to arrive" and I think "What is seen is seen live, the effects are real and reciprocal".
You start from the a priori that the speed of light (value c) is something real, because it is physically measured. It goes without saying that the a priori is fierce.
R.H.