[time-nuts] Detecting gravity with optical atomic clocks

[djl]

Where does the relaxation time of ~ 1 hr arise??
Don

On 2018-12-01 06:17, Tom Van Baak wrote:
>> Surely, this is nothing new?
> 
> Once or twice a year some national lab, often NIST, makes an
> announcement of a new level of precision for their atomic clocks. It's
> pretty cool, actually. It's good PR. The rate of progress is amazing.
> 
>> I thought standard pendulum clocks were quite good at detecting 
>> gravity as well!
> 
> Yes and no. Modern uses for precision gravity measurement often
> require precise data while flying or in orbit. Pendulum clocks don't
> do well in those conditions.
> 
>> They make excellent earth-quake detectors - Randall Peters published 
>> many excellent papers on this subject many years ago, fascinating 
>> stuff.
> 
> Yes. For example, see the pendulum results of yesterday's earthquake:
> 
> http://leapsecond.com/pend/synchronome/quake.htm
> 
>> John Moran
> 
> /tvb
> 
> 
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-- 
Dr. Don Latham  AJ7LL
PO Box 404, Frenchtown, MT, 59834
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