It's not the same thing.

Jean-Pierre Messager alleging that the comparison of the reference frames of Bella and Stella between them,
in the famous problem of the double traveler of Tau Ceti, it was the same thing (he considers that in the Terrence-Bella report, it is the same phenomenon that occurs as in the Stella-Bella report, because, he says , Terrence like Stella are in Galilean frames of reference, and that there is therefore the same phenomenon which links them.
 In short, he wants us to treat Stella the way we treat Terrence.
 I understand his grievances.
 But that's not how it works, and I have the worst difficulty convincing my sweetheart, formatted as he is in Minkowskian geometry, that he takes for the Phoenix of relativistic geometries.
 I'll explain to him how it works.
 In the first frame of reference, that of Terrence, the departure takes place in A and the arrival in B. But A and B are not spatially in the same place for the two participants.
 In the second, events A and B are in the same place for both speakers.
 It's not the same thing.
 Furthermore, I have said and repeated that if the start was not made at rest, the equality of clean times was no longer assured in Terrence's case.
 Now, the highlight of the show and the beauty of reasoning.
 The first diagram shows what happens between Terrence and his two sisters, and we can already see that the two sisters will have equal time.
<http://news2.nemoweb.net/jntp?45YM3ho2qHlFfZEkhlnrNslahOY@jntp/Data.Media:1>
The other shows what is happening between Bella and Stella (and vice versa) and the equality of proper tenses, as in the first diagram (otherwise it would be absurd).
<http://news2.nemoweb.net/jntp?45YM3ho2qHlFfZEkhlnrNslahOY@jntp/Data.Media:2>
Je vous remercie de votre attention.
R.H. --
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