[time-nuts] Sidereal timekeeping

Brooke Clarke brooke at pacific.net
Sun May 15 21:39:57 UTC 2011


Hi Antonio:

Another way to do it is to use any common crystal (10 MHz would have 
advantages) and a small PIC micro controller to generate the sidereal * 
2^15 frequency.
Note this can be done to very high precision.  
http://www.prc68.com/I/PIC16F88.shtml#PIT

Have Fun,

Brooke Clarke
http://www.PRC68.com


iovane at inwind.it wrote:
> Hi all,
> does anybody out there have any ideas as where to find a 32859Hz crystal (1/2
> that value would be better) to be used to replace 32768 crystals in ordinary
> clocks? I think that 32768 crystals cannot be dragged that much. I've already
> read the JimLux article somewhere on the web, but I would be pleased finding a
> simpler solution. Also, I already have computer programs that show sidereal
> time.
> Thanks,
> Antonio I8IOV
>
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