التوقيت الذري الدولي (TAI)
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<timefyi-glossary slug="tai"></timefyi-glossary>التعريف
مقياس زمني دولي دقيق للغاية يعتمد على ساعات ذرية، يختلف عن UTC بعدد ثابت من الثواني المحدَّثة.