International Atomic Time ( TAI, from the French name Temps atomique international ) is a high-precision atomic coordinate time standard based on the notional passage of proper time on Earth's geoid.

The SI second was defined in terms of the caesium atom in 1967, and in 1971 it was renamed International Atomic Time ( TAI ).

While TT is strictly uniform ( being based on the SI second, every second is the same as every other second ), it is in practice realised by International Atomic Time ( TAI ) with an accuracy of about 1: 10 < small >< sup > 14 </ sup ></ small >.

International Atomic Time ( TAI ) was set equal to UT2 at 1 January 1958 0: 00: 00.

* International Encyclopedia of the Social & Behavioral Sciences ( 2001 ), Statistics, " Econometrics and Time Series ," links to first-page previews of 21 articles.

* Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War, continues to May 9 ( International )

* International Atomic Time

He met privately with Michael Bloomberg for 10 minutes, then met with CEO's, including Douglas N. Daft ( Coca-Cola Company ), Gerald M. Levin ( AOL Time Warner Inc .), Maurice R. Greenberg ( American International Group, commercial insurer ), and Dean O ' Hare ( Chubb Corporation, insurer ).

At approximately 9: 40 AM Eastern Daylight Time on April 27, 2012 Enterprise took off from Dulles International Airport en-route to a fly-by over the Hudson River, New York's JFK International Airport, the Statue of Liberty, the George Washington and Verrazano-Narrows Bridges, and several other landmarks in the city ; in an approximately 45-minute " final tour ".

At 11: 23 AM Eastern Daylight Time Enterprise touched down at JFK International Airport.

Terrestrial Time ( TT ) is a modern astronomical time standard defined by the International Astronomical Union, primarily for time-measurements of astronomical observations made from the surface of the Earth.

TT indirectly underlies UTC, via International Atomic Time ( TAI ).

* To millisecond accuracy, TT runs parallel to the atomic timescale ( International Atomic Time, TAI ) maintained by the BIPM.

A definition of a terrestrial time standard was adopted by the International Astronomical Union ( IAU ) in 1976 at its XVI General Assembly, and later named Terrestrial Dynamical Time ( TDT ).

More precisely, it was defined that TT instant 1977-01-01T00: 00: 32. 184 exactly and TCG instant 1977-01-01T00: 00: 32. 184 exactly correspond to the International Atomic Time ( TAI ) instant 1977-01-01T00: 00: 00. 000 exactly.

* International Atomic Time

* June 30 – The International Time Bureau adds the first leap second ( 23: 59: 60 ) to Coordinated Universal Time ( UTC ) at the end of the month.

Historical Julian dates were recorded relative to GMT or Ephemeris Time, but the International Astronomical Union now recommends that Julian Dates be specified in Terrestrial Time, and that when necessary to specify Julian Dates using a different time scale, that the time scale used be indicated when required, such as JD ( UT1 ).

# January 1, 2000, 11: 59: 27. 816 TAI ( International Atomic Time ).

* Ephemeris Time ( ET ) was from 1952 to 1976 an official time scale standard of the International Astronomical Union ; it was a dynamical time scale based on the orbital motion of the Earth around the Sun, from which the ephemeris second was derived as a defined fraction of the tropical year.

TDT is tied in its rate to the SI second, as is International Atomic Time ( TAI ), but because TAI was somewhat arbitrarily defined at its inception in 1958 to be initially equal to a refined version of UT, TT is offset from TAI, by a constant 32. 184 seconds.

The International Bureau of Weights and Measures ( BIPM, France ), combines these measurements to retrospectively calculate the weighted average that forms the most stable time scale possible.

* Bureau International des Poids et Mesures: TAI

* Bureau International des Poids et Mesures: TAI TIME DISSEMINATION SERVICES, AUTHORITIES RESPONSIBLE FOR THE TIME DISSEMINATION SERVICES

For a while in the 1920s and 1930s there was a Green International ( International Agrarian Bureau ) based on the peasant parties in Bulgaria, Czechoslovakia, Poland and Serbia.

* International Agrarian Bureau

The symbol ua is recommended by the International Bureau of Weights and Measures, and the international standard ISO 80000, while au is recommended by the International Astronomical Union, and is more common in Anglosphere countries.

Carnegie contributed $ 1, 500, 000 in 1903 for the erection of the Peace Palace at The Hague ; and he donated $ 150, 000 for a Pan-American Palace in Washington as a home for the International Bureau of American Republics.

The International Bureau of Weights and Measures (), is an international standards organisation, one of three such organisations established to maintain the International System of Units ( SI ) under the terms of the Metre Convention ( Convention du Mètre ).

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# REDIRECT International Bureau of Weights and Measures

For example, the U. S. Bureau of Alcohol, Tobacco, Firearms and Explosives ( ATF ) supports the United States ' International Traffic in Arms Regulations ( ITAR ) program " to aggressively enforce this mission and reduce the number of weapons that are illegally trafficked worldwide from the United States and used to commit acts of international terrorism, to subvert restrictions imposed by other nations on their residents, and to organized crime and narcotics-related activities.

The IHO was established in 1921 as the International Hydrographic Bureau ( IHB ).

The former name International Hydrographic Bureau was retained to describe the IHO secretariat comprising three elected Directors and a small staff at the Organization's headquarters in Monaco.

* International Computation Centre, in Rome, Italy, created by UNESCO in 1951, later transformed into the Intergovernmental Bureau for Informatics

For example, the Division of International Labour Comparisons of the U. S. Bureau of Labor Statistics prepares the hourly compensation in manufacturing indicator.

However, he was re-admitted in 1930 and was one of the few former oppositionists to retain a prominent place within the party, heading the International Information Bureau of the Russian Communist Party Central Committee as well as giving the main address at the First Soviet Writer's Conference in 1934.

Prominent left communist groups existing today include the International Communist Current and the International Bureau for the Revolutionary Party.

* Bureau International des Poids et Mesures.