Thanks. Tom. Glad to see the references.
I've some experience with clock time difference, as I showed an astonishing
number of years ago that the phase changes between two clocks as measured by
their respective LORAN-C signals was due to changes in the atmospheric index
of refraction for 100 KHz radio waves rather than some wierd effect of
general relativity.
Maybe some similar inattention to Occam's Razor was responsible for the
shift associated with the eclipse. I will be observing this month's eclipse
in China. Unfortunately, I will not have an assembly of atomic clocks to
check. I'll look at my watch :-).
Solar eclipses do have an effect on the earth's "fair-weather" electric
field; I have measured it. This is due to an effect on local boundary-layer
air motions very close to the surface from loss of solar heating.
I can see absolutely no reason for a change in atomic clock behavior,
however, if it is carefully shielded from this temperature pulse. Maybe we
should also check during the next Grand Conjunction just in case.
Don
----- Original Message -----
From: <iov...@inwind.it>
To: "time-nuts" <time-nuts@febo.com>
Sent: Thursday, July 09, 2009 3:02 PM
Subject: Re: [time-nuts] 10811 crystal orientation
You are right, Tom, there are two mixed topics.
On the on-topic subject, instead of making tests to measure the frequency
dependence on orientation, It would be much more interesting looking at
possible ADEV dependences on orientation, particularily for small tau (the
bottom of the curve). I can't do the test myself now, but would be pleased
to see it done. For someone here it should be easy. I suggest comparing
the measurements made with the crystal on the horizontal plane vs a
vertical plane.
On the pseudo-science subject, I would recall that the experiment you
pointed us to (null result) was made in Germany for NASA under NASA
invitation.
The results of the tests are in conflict with previous tests made in China
by
S.W.Zhou -cesium clocks changed rate- and known to Nasa (I gave the link
some
posts back), and the matter is not yet solved. Maybe time-nuts could help
in
the process of understanding what happened.
Antonio I8IOV
tvb wrote:
> Agreed. Has anyone done the crucial experiment? establish stats, rotate
> assembly, establish stats, etc? Should be able to measure at least if
> there is an effect, and also if it is present, an approximate
> magnitude...
> Don
Hi Don,
There are two rather different topics here.
One is do crystal oscillators change frequency when they
are turned. The answer to that is yes. This gravitational
acceleration effect is rather huge, parts in ten to the 9th
or so, and anyone can see this. This is why you never
touch, bump, or move, or rotate a laboratory frequency
standard (this includes GPSDO and cesium standards).
The other question is what happens to quartz crystals or
pendulum clocks or werewolves during a solar eclipse.
This is the possible pseudo-science topic, although I do
applaud anyone who carefully looks into it. A recent and
good example of such an experiment is described here:
"Effect of the 1999 Solar Eclipse on Atomic Clocks"
<http://www.mpq.mpg.de/~haensch/comb/people/thomas/Nature99.pdf>
"On the Behaviour of Atomic Clocks during the
1999 Solar Eclipse over Central Europe"
<http://www.mpq.mpg.de/~haensch/eclipse/full.html>
/tvb
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