[time-nuts] Primary standard again

Lux, Jim (337C) james.p.lux at jpl.nasa.gov
Tue Feb 23 23:19:38 UTC 2010


Aren't there relativistic effects on Cs standard frequency because of different gravity? (or is that really, the "same" frequency, just in a different frame of reference)

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of J. Forster
> Sent: Tuesday, February 23, 2010 1:43 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Primary standard again
> 
> A REAL "primary standard" is something that you can assemble the kit of
> parts anywhere in the Universe, flip the switch, and get exactly the same
> time interval as anywhere else.
> 
> That obviously does NOT apply to the pendulum, as it depends on the value
> of G.
> 
> -John
> 
> ==================
> 
> 
> > I suppose a pendulum can be a primary standard at some accuracy.  Using
> > the "kit of parts" analogy, if one builds the pendulum and operates it at
> > sea level, the period of the pendulum is entirely determined by the
> > physical dimensions and the gravitational constant.




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