[time-nuts] Valentines Day & Love Numbers

[Hal Murray]

brooke at pacific.net said:
> I wonder if NIST has one of the GWR gravitymeters on a pier and uses that to
> discipline their fountain clocks for the elevation change of the pier or if
> that's done for the GPS reference antennas?

Radio astronomers pay serious attention to earth tides.  For VLBI, they need 
to know where their antennas are located down to a fraction of a wavelength.

An example, from google:

Tidal deformations of the earth from VLBI observations
http://link.springer.com/article/10.1134%2FS1063773712050027
 

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