[time-nuts] Sidereal seconds

Azelio Boriani azelio.boriani at screen.it
Fri Mar 2 09:14:40 UTC 2012


What do you mean by "make such a chip"? If it is a PIC then it is only a
PIC programming matter or programming a CPLD. To make chips you have to go
to a foundry.

On Fri, Mar 2, 2012 at 5:13 AM, Neville Michie <namichie at gmail.com> wrote:

> I have a problem with two pendulum clocks that interfere with each other,
> even though they are bolted to a brick wall on bedrock foundations.
> A solution to this problem is to run one on mean time the other on
> sidereal time. Then I can analyse the operation of each of them.
> Now there is a problem with sidereal time that neither the GPS system or
> WWV transmit reference signals for sidereal time and the
> method of converting mean time to sidereal by calculation is difficult for
> clock synchronisation.
> A possible solution is to take mean time (from a TBolt 10MHz) and divide
> it by 9,972,695.7 to give a PPS(sid) signal that can run a digital clock
> dial
> and give one second(sid) ticks to phase the pendulum. It may be simpler to
> divide by 9,972,696 to stay with integer division and have an error in the
> order of a second per annum. (which we have from leap seconds anyway).
> TVB made some picDIV chips with a synch pin that do a similar task, but
> have I got the number correct? and are there other nuts that would
> like to add a sidereal clock to their clock vaults to make it worth while
> to make such a chip?
> If I set up the sidereal clock then I can use my theodolite to check time
> against the stars.
> cheers,
> Neville Michie
> Sydney
> Australia
>
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