Re: An interesting SR puzzle

From: Franz Heymann (notfranz.heymann_at_btopenworld.com)
Date: 02/17/05 

Date: Thu, 17 Feb 2005 17:38:56 +0000 (UTC)

"John Kennaugh" <JKNG@kennaugh2435hex.freeserve.co.uk> wrote in
message news:rbNSCNSlU5ECFwGh@kennaugh2435hex.freeserve.co.uk...
> In message <cudv81$qd9$1@dolly.uninett.no>, Paul B. Andersen
> <paul.b.andersen@deletethishia.no> writes
> >Sue... wrote:
> >> An event can't be observed before it occurs but calculate to your
> >> heart's content if it makes you feel better.
> >> Sue...
> >>
> >
> >I suppose this truism is supposed to be a defence of your
> >statement:
> >Sue wrote:
> >| Anyone observing a blueshifted clock at constant distance, will
sooner
> >| or later be expected to observe a tick before it occurs, an
obvious
> >| causality violation.
> >
> >This time I am asking you:
> >How did you arrive at this conclusion?
> >Show the logic.
> >Repeating the conclusion won't do.
> >
> >But you won't because you can't, right?
>
> If something is 'blueshifted' it is coming towards you, so surely
> observing something blueshifted cannot be at a constant distance by
> definition. - or have I missed something.

Yes, you have. You and the clock might be at different positions in a
gravitational field. 

-- 
Franz
One Galileo in 2000 years is enough.  Pope Pius XII

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