[time-nuts] Sidereal timekeeping

Jim Lux jimlux at earthlink.net
Wed May 18 12:58:09 UTC 2011


On 5/18/11 2:18 AM, iovane at inwind.it wrote:
> Michael wrote:
>>> You are right, the right value for the crystal would be about 32859.27, but
> I
>>> thought that such a difference could be compensated in the circuitry,
> that's
>>> why I omitted the decimals.
>>>
>> before you get into grinding I have a question on your chosen frequency.
>> It doesn't square for me.
>>
>>      1,002737909350795  solar/sidereal time ratio
>>
>>               x 32768  crystal frequency
>>
>> 32857,72   required frequency for sidereal clock with 2^15 divider chain
>
> I agree with your calculation.
>
> Here I ask Jim Lux for help, as when I wrote the first post I simply took that
> value from his article without re-checking.
>
> http://www.techbriefs.com/component/content/article/2299
>

I think there was an error in that article (most likely a typo somewhere 
in the transcription process).  I'll go check.  But your calculation 
above is correct.



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