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.
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