Who sets the time on the atomic clocks ?

Answer 1

This public service is cooperatively provided by the two time agencies of the United States: a Department of Commerce agency, the National Institute of Standards and Technology (NIST), and its military counterpart, the U. S. Naval Observatory (USNO). Readings from the clocks of these agencies contribute to world time, called Coordinated Universal Time (UTC). The time maintained by both agencies should never differ by more than 0.000 0001 seconds from UTC.

I know there is an atomic clock in Europe but I couldn't find any info on it. I believe over there the Royal Observatory is responsible for that one.

Answer 2

The time is set by the International Bureau of Weights and Measures (BIPM), near Paris France.

There are atomic clocks all over the world. The "master" clock for the US Department of Defense is kept by the US Navy Observatory in Washington D.C. The "master" is really the average of several clocks.

Each clock's reading is corrected for its offset and frequency drift. These are measured relative to the average of many clocks world wide. The world standard International Atomic Time is the average computed by the BIPM. They use clock information from 59 locations.

Atomic time has been kept since 1956. BIPM has been doing the averaging since 1961, when they started with only 3 clocks.

Answer 3

According to Wikipedia it is the NAtional Bureauof Standards.

The first atomic clock was built in 1949 at the U.S. National Bureau of Standards (NBS). The first accurate atomic clock, a cesium standard based on the transition of the cesium-133 atom, was built by Louis Essen in 1955 at the National Physical Laboratory in the UK. This led to the internationally agreed definition of the second being based on atomic time.

Answer 4

The U.S. Naval Observatory.

Answer 5

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