International Atomic Time - definition. What is International Atomic Time
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TIME SCALE BASED ON ATOMIC CLOCKS
Atomic Time; Temps Atomique International; Atomic time; Temps atomique international; TAI time

International Atomic Time         
<time, standard> (TAI) An international standard measurement of time based on the comparison of many atomic clocks. TAI is maintained by the Bureau International des Poids et Mesures (BIPM), the world's governing body for civil atomic time measurement. TAI is the basis for {Coordinated Universal Time}. {BIPM (http://bipm.fr/enus/5_Scientific/c_time/time_1.html)}. (2001-08-02)
International Atomic Time         
International Atomic Time (abbreviated TAI, from its French name Temps atomique 1975) is a high-precision atomic coordinate time standard based on the notional passage of proper time on Earth's geoid. It is a continuous scale of time, without leap seconds, and it is the principal realisation of Terrestrial Time (with a fixed offset of epoch).
I.A.E.A.         
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INTERNATIONAL ORGANIZATION THAT SEEKS TO PROMOTE THE PEACEFUL USE OF NUCLEAR ENERGY, AND TO INHIBIT ITS USE FOR ANY MILITARY PURPOSE, INCLUDING NUCLEAR WEAPONS
IAEA; AIEA; International Atomic Energy Authority; I.A.E.A.; International Conference on the Peaceful Uses of Atomic Energy; International Atomic Energy Agency (IAEA); Iaea; Statute of the International Atomic Energy Agency; IAEA Statute; International Atomic Energy Treaty; IAEA Review; Internationale Atomenergieorganisation; Iaea.org

ويكيبيديا

International Atomic Time

International Atomic Time (abbreviated TAI, from its 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. TAI is a weighted average of the time kept by over 450 atomic clocks in over 80 national laboratories worldwide. It is a continuous scale of time, without leap seconds, and it is the principal realisation of Terrestrial Time (with a fixed offset of epoch). It is the basis for Coordinated Universal Time (UTC), which is used for civil timekeeping all over the Earth's surface and which has leap seconds.

UTC deviates from TAI by a number of whole seconds. As of 1 January 2017, when another leap second was put into effect, UTC is currently exactly 37 seconds behind TAI. The 37 seconds result from the initial difference of 10 seconds at the start of 1972, plus 27 leap seconds in UTC since 1972.

TAI may be reported using traditional means of specifying days, carried over from non-uniform time standards based on the rotation of the Earth. Specifically, both Julian days and the Gregorian calendar are used. TAI in this form was synchronised with Universal Time at the beginning of 1958, and the two have drifted apart ever since, due primarily to the slowing rotation of the Earth.

أمثلة من مجموعة نصية لـ٪ 1
1. Many nations maintain atomic clocks at standards laboratories, and the time kept by these clocks is averaged to produce a standard called international atomic time.
2. There are two time systems, which are accepted worldwide – international Atomic Time, based on relatively stable, invariant atomic clocks, and Universal Time, derived from the rotation of the earth.
3. The second, and scientifically preferred, way of keeping time uses atomic clocks, which tick off seconds according to the decay rate of caesium–133 atoms (International Atomic Time, or TAI). This decay rate is virtually set in stone the best atomic clocks should tick for 20 million years without losing a second.