Yes, but first you need a very stable pendulum clock as pointed out by TVB, a stability better than 0.05ppm for a mechanical clock is a real challenge.
<http://leapsecond.com/hsn2006/pendulum-tides-ch5.pdf> On Thu, Oct 29, 2015 at 12:56 PM, Jim Lux <[email protected]> wrote: > On 10/28/15 7:48 PM, Jim Lux wrote: >> >> On 10/28/15 7:23 AM, Peter Reilley wrote: >>> >>> I have been pondering pendulum clocks. I was wondering what the ADEV >>> of a >>> pendulum would show. I assume that you could see the errors in the >>> gear train. >>> You should see the period of each gear. You should see the spring wind >>> down >>> and being rewound. >>> >>> Further, would you be able to see the phase of the moon and the tides? >>> This >>> is using the pendulum as a gravimeter. Would it be sensitive enough >>> for that? >>> >> >> yes.. it's in the sub-ppm range, as I recall. >> >> Period goes as sqrt(L/g) >> >> >> from wikipedia >> lunar tidal acceleration at the Earth's surface along the Moon-Earth >> axis is about 1.1 × 10−7 g, while the solar tidal acceleration at the >> Earth's surface along the Sun-Earth axis is about 0.52 × 10−7 g >> >> >> So sqrt(1/(1+1E-7))... about 0.05 ppm >> > > so you'd need an ADEV <1E-9 at a tau of 12 hours > > >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
