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From: hitlong@yahoo.com (gharnagel)
Newsgroups: sci.physics.relativity
Subject: Re: Relativistic aberration
Date: Mon, 15 Jul 2024 16:12:40 +0000
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On Mon, 15 Jul 2024 12:55:23 +0000, Richard Hachel wrote:
>
> Le 15/07/2024 à 14:33, hitlong@yahoo.com (gharnagel) a écrit :
> >
> > On Mon, 15 Jul 2024 11:58:07 +0000, Richard Hachel wrote:
> > >
> > > I beg you to understand something about the simple things I say here
> on
> > > this forum.
> >
> > Feel assured, I DO understand.
>
> So your presence is a true miracle.
>
> > > 1. Two observers who cross paths, and according to Hachel's (or
> > > Poincaré's, properly understood) transformations, have exactly the
> same
> > > vision of the universe and at the same instant (as long as we
> understand
> > > the notion of universal simultaneity).
> >
> > Dr. Hachel is describing Newton's universe, not Poincaré's.
>
>  No.
>
>  No no. Absolutely not.

"Universal simultaneity" IS Newtonian physics.

> For example, if you ask Hachel what is the duration of a uniformly
> accelerated journey to Tau Ceti, he will answer:
> To=(x/c).sqrt(1+2c²/ax)

Dr. Hachel doesn't define his terms.  Is To wrt the traveler or the
earth?  Is a and x wrt the traveler or the earth?  This problem has
been solved many times and are freely available on the internet.
For example, http://www.zitterbug.net/future/casr0715.pdf.

> and he will ask all students around the world to learn this formula by
> heart.

Why would anyone want to memorize that when there is so much better
stuff
around?

> This is not a Newtonian formula.

Of course it's not, but universal simultaneity IS Newtonian.

> We will say: therefore he is a relativist like Einstein.

> No, he is a relativist like Hachel, and uses a different geometry for
> space and time problems.

And wrong.

> As well as different equations, sometimes different transformations. But
> not much Newtonian in there.
> Example: what is the formula giving the instantaneous speed of uniformly
> accelerated objects?
> Voi/c=[1+c²/2ax]^-(1/2)
> This formula does not exist either in Newton or Einstein.

And does not describe anything in the universe.

> Another example: transformations into rotating frames of reference.
>
> <http://news2.nemoweb.net/jntp?_hiIkN_NB6Jm2XOJZeHK7Fy9L2E@jntp/Data.Media:1>
>
> These transformations do not exist neither in Newton nor in Einstein.
>
> R.H.

And do not describe anything in the universe.  Making up equations out
of
thin air does not make one a savant.