[time-nuts] One Kg Quartz Resonator
bg at lysator.liu.se
bg at lysator.liu.se
Wed Jan 23 09:34:23 UTC 2013
>
>> 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
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