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Samples in periodicals archive:
The ACES experiment payload will also help improve the precision and long-term stability of international atomic time (TAI) and coordinated universal time (UTC).
International Atomic Time is calculated by the International Bureau of Weights and Measures (BIPM) from the readings of more than 200 atomic clocks located in metrology institutes and observatories in more than 30 countries around the world.
As a result, Earth gets out of step with International Atomic Time (TAI), which uses the pulsation of atoms to measure time to an accuracy of several billionths of a second.