GPS Time actually come from a "paper clock" composed of all satellite
and ground station clocks: <http://tycho.usno.navy.mil/gpstt.html>.
-- Richard
Quoting Tony Finch <[email protected]>:
On Mon, 7 Feb 2011, Steve Allen wrote:
Until there is an ensemble of cesium chronometers not on the surface of
the earth there is no easy way to measure the potential depth to 1e-10,
so the corrections currently being used to compensate for the NIST and
PTB chronometers being about a mile high are as good as things can get.
The PTB campus is at about 75m above sea level.
Also, doesn't the GPS count as an ensemble of atomic clocks?
Tony.
--
f.anthony.n.finch <[email protected]> http://dotat.at/
HUMBER THAMES DOVER WIGHT PORTLAND: NORTH BACKING WEST OR NORTHWEST, 5 TO 7,
DECREASING 4 OR 5, OCCASIONALLY 6 LATER IN HUMBER AND THAMES. MODERATE OR
ROUGH. RAIN THEN FAIR. GOOD.
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Richard B. Langley E-mail: [email protected]
Geodetic Research Laboratory Web: http://www.unb.ca/GGE/
Dept. of Geodesy and Geomatics Engineering Phone: +1 506 453-5142
University of New Brunswick Fax: +1 506 453-4943
Fredericton, N.B., Canada E3B 5A3
Fredericton? Where's that? See: http://www.city.fredericton.nb.ca/
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