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[–] 6 points 2 years ago (3 children)
  • [–] 12 points 2 years ago (2 children)

    Or why not just seconds past the epoch?

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  • [–] 2 points 2 years ago (1 child)
  • [–] -1 points 2 years ago (2 children)

    Reasons just states difference, but does not answer why.

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  • [–] 4 points 2 years ago (1 child)

    On the other hand, TAI does not take into account the variations in Earth's rotation speed, which determines the true length of a day. For this reason, UTC is constantly compared to UT1. Before the difference between the two scales reaches 0.9 seconds, a leap second is added to UTC.

    On average, Earth has been slowing down a bit over the past decades, so UTC is currently running 37 seconds behind TAI.

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