Re: Time Dilation Test
- From: "Peri of Pera" <riedt1@xxxxxxxxxxx>
- Date: 4 Apr 2006 18:46:05 -0700
Tom Roberts wrote:
Peri of Pera wrote:
To test the proposal that in the local frame a second varies with the
value of v, a simple experiment can be carried out. An atomic clock at
the North pole and another one at the equator should differ by 37,528
nanoseconds in the course of a year if time dilation applies.
Only if both are the same height above the geoid at their respective
locations.
In fact, such measurements _have_ been performed over many years by
comparing clocks located at various countries' standards organizations
(e.g. Greenwich, Paris, Washington DC, Boulder CO, ...). The need to
correct for the effects predicted by GR is well established to high
accuracy. This includes time dilation due to the earth's rotation
(reflected in the altitude of the geoid), and gravitational redshift due
to height above the geoid.
Tom Roberts tjroberts@xxxxxxxxxx
Tom, I understand that you believe there are other factors involved in
time dilation such as the geoid. Pure and simple time dilation
apparently has to be qualified every time it is questioned. Does the
geoid or some other fudge apply in the twin paradox ? H&K compared
their flying clocks with a stationary one in Denver. They used the
simple formula and one adjusted for gravity. If we compare atomic
clocks with one on orbital satellites, we should get a difference of 11
microseconds per year. There are many atomic clocks located in many
countries. Have they ever reported time dilation differences or does it
only apply to theoreticals like the twin paradox?
Peter Riedt
.
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