Greenwich Mean Timt, GMT and Universal Coodinated Time, UT

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Philosophaie
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What is the difference between the time scales of Greenwich Mean Timt, GMT and Universal Coodinated Time, UT?

I know it ticks with TAI but is 34 seconds off due to leap seconds keeping the UT1-UTC ratio below 0.9 due to the slowing of the Earth's rotation.
 
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