• uis@lemm.ee
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    7 months ago

    Reasons just states difference, but does not answer why.

    • dukk@programming.dev
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      7 months ago

      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.