[time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

[Tom Holmes]

Mark...
You're place really moved a foot in 48 hours? Impressive and scary!

From Tom Holmes, N8ZM

> On Dec 9, 2017, at 8:19 PM, Mark Sims <holrum at hotmail.com> wrote:
> 
> Which gets real fun with things like solid earth tides getting involved.   Lady Heather can now calculate and plot solid earth tides.   Over the last 48 hours my place moved up/down 315 mm and gravity changed 186  microgals... and that was a rather stable period.
> 
> ------------------
> 
>> A 1 meter change in elevation corresponds to a frequency offset of about 1e-16. So for 1e-18 levels of performance you "only" need to know g, or your elevation to 1 cm accuracy.
> <tides.gif>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.