[LEAPSECS] LEAPSECS Digest, Vol 51, Issue 22

[Richard B. Langley]

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 <dot at dotat.at>:


> 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  <dot at dotat.at>  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: lang at unb.ca
  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/
===============================================================================