Re: Keating & Hafele Anniversary

From: Dr. Photon (brendan.roycroft_at_nmrc.ie)
Date: 03/03/05 

Date: 3 Mar 2005 01:56:29 -0800

"Franz Heymann" <notfranz.heymann@btopenworld.com> wrote in message news:<d05egi$7oj$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com>...
> "Dr. Photon" <brendan.roycroft@nmrc.ie> wrote in message
> news:b8f632e2.0503021048.3cdb70b3@posting.google.com...
>
> [snip]
>
> > So I wonder how many times does this have to be repeated before some
> > people get the message?
>
> Infinite?

Also, do you have a link (or page number) to your reference? I
couldn't find anything in New Scientist or Horizon or NPL on it! I
suppose the experiment you refer to was done in 1997, and Horizon
lists a program called "The Time Lords" in 1997, but doesn't give any
contents or subject matter.

I got a bit worried that we were referring to the same experiment, and
my one was just a "repeat" (in the TV sense of the word) but was
relieved to find that the Royal Institution one went to Shanghai and
back with a calculated delay of 59.7 ns, and was definitely done in
1999 as opposed to 1997.

So the Hafele-Keating expt has been done at least three times, and
each agreed with theory to within an acceptable error.

See also the table on

http://metrologyforum.tm.agilent.com/pdf/flying_clock_math.pdf

which separates out the velocity, height and Sagnac components to the
time shift, so this is definitely not just some Sagnac effect.

regards,

BR

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