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Subject: Re: Relativistic aberration
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Date: Sun, 04 Aug 24 14:28:47 +0000
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From: Richard Hachel <r.hachel@wanadou.fr>
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Le 04/08/2024 à 14:50, "Paul.B.Andersen" a écrit :
> 
> This is about what the observers SEE in their telescopes.
> 
> They are co-located when they receive the light from the supernova,
> so they obviously both see the star as it goes supernova.
> 
> Since earth observers have _measured_ (via parallax ?) the distance
> to the star to be 15000 ly, and the speed of light is c in the
> Earth frame, the earth observer can deduce that the light must
> have left the star 15000 years ago.
> 
> The rocket observer will see in his telescope the star
> as it goes supernova in the direction RA =  12.7⁰ and DEC = 0⁰.
> He has no possibility of knowing the distance to the star or
> when it went supernova, but the Earth observer know that
> since they were co-located at the reception, they both have
> received the light that was emitted 15000 years ago.
> That means that since the speed of light is c in the rocket frame,
> the distance in the rocket frame must be 15000 ly.
> But the rocket observer can't know this without being told.
> 
> But we can calculate that the coordinates of the star as
> it went supernova must have been:
> E '= (x' = 14633 ly, y' = 3297 ly, z' 0 ly, t' = -15000 y)
> 
> Case closed.

If you are anxious about making a fool of yourself in the face of the 
future, do as you please.
Personally, and with care, I have tried to show you your errors of 
concepts.
I can do nothing more.

R.H.