Since 30 June 2012 when the last leap second was added, TAI has been exactly 35 seconds ahead of UTC.

TAI in this form was synchronised with Universal Time at the beginning of 1958, and the two have drifted apart ever since, due to the changing motion of the Earth.

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

The continued existence of TAI was questioned in a 2007 letter from the BIPM to the ITU-R which stated " In the case of a redefinition of UTC without leap seconds, the CCTF would consider discussing the possibility of suppressing TAI, as it would remain parallel to the continuous UTC.

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

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.

Because of the historical difference between TAI and ET when TT was introduced, the TAI realization of TT is defined thus:

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.

where L = 1. 550519768, TDB = − 6. 55 s, T = 2443144. 5003725, and JD is the TCB Julian date ( that is, a quantity which was equal to T on 1977 January 1 00: 00: 00 TAI at the geocenter and which increases by one every 86400 seconds of TCB ).

More precisely, it was defined that TCB instant 1977-01-01T00: 00: 32. 184 exactly corresponds to the TAI instant 1977-01-01T00: 00: 00. 000 exactly, at the geocenter.

More precisely, it was defined that TCG instant 1977-01-01T00: 00: 32. 184 exactly corresponds to TAI instant 1977-01-01T00: 00: 00. 000 exactly.

Air Madagascar was formed in March 1947 by Transports Aériens Intercontinentaux in order to feed into flights by TAI and Air France.

In 1957 TAI and Messageries Maritimes acquired shares in the airline, and in 1958 a third DC-3 was added to the fleet.

On 20 October 1961 a service from Antananarivo-Paris, via Djibouti, with a Douglas DC-7 leased from TAI was inaugurated.

It is the new name for the former TAI – Transporti Aerei Italiani and the former Air Columbia and was operating two Fairchild Metro aircraft from Pescara to Milan and Rome in April 2004 ( replaced by a Dornier 328Jet in January 2005 and a second one in August 2005 ).

Doing so does not create another version of TAI ; it is instead considered to be creating a better realisation of Terrestrial Time ( TT ).

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 >.

: TT − TAI =

This difference may be assumed constant — the rates of TT and TAI are designed to be identical.

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.

TT is ahead of TAI, and can be approximated as TT ~= TAI + 32. 184 seconds.

The main realization of TT is supplied by TAI.

: TT ( TAI ) = TAI + 32. 184 s

It is thus possible to produce a better realization of TT based on reanalysis of historical TAI data.

They are published in the form of table of differences from TT ( TAI ).

This new pulsar time scale will serve as an independent means of computing TT, and it may eventually be useful to identify defects in TAI.

The participating institutions each broadcast, in real time, a frequency signal with time codes, which is their estimate of TAI.

The latter is not to be confused with TA ( NPL ), which denotes an independent atomic time scale, not synchronised to TAI or to anything else.

Its successor time scales, such as TDT, as well as the atomic time scale IAT ( TAI ), were designed with a relationship that " provides continuity with ephemeris time ".

It ticks SI seconds, in step with TAI.

This dinner was the start of a new blatancy in the relationship between the gangs and the politicians, which, prior to 1924, says Pasley, `` had been maintained with more or less stealth '', but which henceforth was marked by these ostentatious gatherings, denounced by a clergyman as `` Belshazzar feasts '', at which `` politicians fraternized cheek by jowl with gangsters, openly, in the big downtown hotels ''.

With the death of the last Count, Nicholas of Abensberg, in 1485, the estates fell to the Duchy of Bavaria-Munich, meaning that henceforth only the Bavarian coat of arms was ever used.

), Amasis was able to defeat an invasion of Egypt by the Babylonians under Nebuchadrezzar II ; henceforth, the Babylonians experienced sufficient difficulties controlling their empire that they were forced to abandon future attacks against Amasis.

The new work, which was henceforth to set the fashion to French literature, was written in lines of twelve syllables, but with a freedom of pause which was afterwards greatly curtailed.

He convinced the Soviet government that borzoi were a valuable asset to the hunters who supported the fur industry and henceforth, their breeding was officially regulated.

Upon his father succeeding to the family peerage in 1987, he was henceforth known as The Hon.

After signing a letter of submission and promising never to write anything prejudicial against the religion again ( with the result that his most controversial works were henceforth published only after his death ), Diderot was released from the dungeons of the Vincennes fortress after three months.

After abdicating, Heizei moved to Nara and was henceforth known as Nara no Mikado, the " Emperor of Nara ".

Such was the hatred he henceforth conceived against his former benefactor, that he did his very utmost to effect Oldebarneveldt's ruin.

Galatia was henceforth dominated by Rome through regional rulers from 189 BC onward.

Avis subsequently married Robert Parsons, whose surname was adopted by Ingram ( henceforth he would be known as Gram Parsons ).

In 2005, the purse distribution for the Derby was changed, so that horses finishing fifth would henceforth receive a share of the purse ; previously only the first four finishers did so.

In 1842 he was appointed professor of mineralogy in the university of Dorpat ( Tartu ), and henceforth gave attention to the geology and mineralogy of the Russian Empire.

The name was officially applied to the island in 1644 with these words: " Aquethneck shall be henceforth called the Isle of Rodes or Rhode-Island.

This effectively eliminated the notion of allied legions ; henceforth all Italian legions would be regarded as Roman legions, and full Roman citizenship was open to all the regions of Italy.

Apologising for having called the monks ' tenants to service in his army when there had been no national call-up, Bruce pledged that, henceforth, he would " never again " require the monks to serve unless it was to " the common army of the whole realm ", for national defence.

The model became known informally as TCP / IP, although formally it was henceforth called the Internet Protocol Suite.

Some of its staff was assumed into the Bundesmarine ( which was henceforth called Deutsche Marine ), some by the German Border Police.

The town was first mentioned in the records in 1121 in connexion with Count Adalbert of Haimar who had moved here from the region near Hildesheim and henceforth was titled the Count of Wernigerode.