[time-nuts] Detecting gravity with optical atomic clocks

[Bob kb8tq]

Hi

There are indeed “Gravity Nuts” who would scoff at the limited sensitivity of a conventional clock 
as a gravity measurement device……Lots of interesting hobbies to fiddle with ….

Bob

> On Dec 1, 2018, at 8:17 AM, Tom Van Baak <tvb at leapsecond.com> 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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