[time-nuts] One Kg Quartz Resonator

[bg at lysator.liu.se]

>
>> Isn't it defined for zero sea-level, that is standard acceleration?
>
> How do you define sea level?

http://en.wikipedia.org/wiki/EGM96
http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm2008/egm08_wgs84.html

>
> Daniel Kleppner's Time Too Good to Be True in
> Physics Today, March 2006
> pointed out that the time-geeks will soon own the definition of sea level.

You need to use a lot of time-geek-tools to have a working GPS or VLBI
system.

/Björn