[time-nuts] Earth: An Oscillator and Frequency Standard

[Dr Bruce Griffiths]

Brooke Clarke wrote:
> Hi Tom:
>
> Thanks for the lab test report on the earth frequency standard.  Since 
> there are a number of frequency/time standards that have much better 
> performance I'd like to find a way to directly measure the performance 
> of the earth standard.  I've thought about a telescope looking at stars 
> or maybe a photo detector to look at the light from the closest star to 
> the earth frequency standard.  Do  you have any ideas on how to make 
> these measurements?
>
> Have Fun,
>
> Brooke Clarke
>
> w/Java http://www.PRC68.com
> w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
> http://www.precisionclock.com
>
>
>
> Tom Van Baak wrote:
>
>   
>>>> Anyway, how do you compute the Allan Deviation of a sun dial?
>>>>      
>>>>
>>>>         
>>> Oh, God, now someone's going to do it...
>>>
>>> John
>>>    
>>>
>>>       
>> Well, yes, thanks for asking! I did it a year ago.
>>
>> The lab report on earth, including Allan deviation is at:
>>
>> http://www.leapsecond.com/museum/earth/
>>
>> /tvb
>>
>>  
>>
>>     
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>   
The conventional solution is either a meridian transit instrument or a 
zenith tube, either of which is much easier and cheaper to construct 
than an accurately rotating platform.

Bruce