Topic
leap second
extra second inserted or removed to keep civil time in sync with the Earth's rotation
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Topic
extra second inserted or removed to keep civil time in sync with the Earth's rotation
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A leap second is a one-second adjustment occasionally applied to Coordinated Universal Time (UTC), to accommodate the difference between International Atomic Time (TAI), as measured precisely by atomic clocks, and observed solar time (UT1), which varies due to irregularities and long-term slowdown in the Earth's rotation.
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