[time-nuts] What's the time Mr Wolf...

Lux, James P james.p.lux at jpl.nasa.gov
Thu Oct 30 21:07:15 UTC 2008

As I recall, the lunar gravity force is on the order of a few ppm of "g" (and I assume solar force is comparable).

So, the period of a pendulum does vary according to the time of day and phase of moon. (about a ppm or so)

I seem to recall that acceleration sensitivity of a crystals is on the order of a ppb/g, so the effect on a XO of the moon is down in the 1E-15 range..


> -----Original Message-----
> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] On Behalf Of M. Warner Losh
> Sent: Thursday, October 30, 2008 12:28 PM
> To: time-nuts at febo.com; sar10538 at gmail.com
> Subject: Re: [time-nuts] What's the time Mr Wolf...
> In message:
> <1231b6a80810301141j70c5d1d4oa088e6827c8dccd at mail.gmail.com>
>             "Steve Rooke" <sar10538 at gmail.com> writes:
> : 2008/10/31 Tom Van Baak <tvb at leapsecond.com>:
> : >
> : >> 11) Extrapolating this, a point on the Equator would be
> moving faster
> : >> that a point at the poles or even Greenwich, for that
> matter. So would
> : >> a clock at each location move out of synchronisation
> with each other?
> : >

> The tidal effects are much smaller than those from position.
> I don't think that these effects are visible at the 10-14 or
> 10-15 level, but since I don't know what level they are
> visible at, I can't be sure.
> I'm sure that someone on this list, maybe as part of their
> PhD thesis, has measured this and can report it :-)
> Warner
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