[time-nuts] Latitude and longitude question

[SAIDJACK at aol.com]

Hi,
 
I just read an article about measuring gravitational waves in the latest  
IEEE about the effects of tides and the moon gravitation on the earth-crust -  
that the earth crust moves up and down about 30cm every day, plus the  
gravitational effects cause about 300ps shift day to day.
 
That's about 1.3 feet (1.3ns or so) of daily vertical deviation just due to  
gravitational effects... That's seems to be alot. Has anyone here seen this  
effect?
 
bye,
Said