TAI (التوقيت الذري الدولي)
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<timefyi-glossary slug="atomic-time"></timefyi-glossary>التعريف
معيار زمني ذري دقيق للغاية يستند إلى أكثر من 450 ساعة ذرية حول العالم. يُشتق UTC من TAI مع تعديلات الثانية الكبيسة.