![]() ![]() If TAI is so precise, why use leap seconds? If one could see an atomic fountain, it would resemble a water fountain. The International System of Units (SI) defines one second as the time it takes a Cesium-133 atom at the ground state to oscillate exactly 9,192,631,770 times.Ītomic clocks are designed to detect this frequency, most of them today using atomic fountains a cloud of atoms that is tossed upwards by lasers in the Earth's gravitational field. The secret to this impeccable precision is the correct measurement of the second as the base unit of modern time-keeping. Atomic clocks deviate only 1 second in up to 100 million years. International Atomic Time is an extraordinarily precise means of time-keeping. It is used to compare the pace provided by TAI with the actual length of a day on Earth.
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