International Atomic Time

International Atomic Time (TAI) is a high-precision time standard that is calculated using the weighted average of atomic clocks from various national laboratories around the world. It is the basis for Coordinated Universal Time (UTC), which is used as the standard time reference for most of the world's time zones. TAI is based on the vibration frequency of atoms of the element caesium-133, which is extremely stable and consistent. The accuracy of TAI is such that it would only lose one second in over 100 million years. TAI is used in a variety of scientific and technological applications, including satellite navigation, astronomy, and telecommunications. It is also used as a reference for the calibration of other time standards, such as GPS time.
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