DUT1

Encyclopedia : D : DU : DUT : DUT1

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The time correction DUT1 is the difference between the Universal Time scale UT1 (which corresponds to Earth's rotation) and the Coordinated Universal Time (UTC) (which corresponds, except for a constant offset, to International Atomic Time (TAI)).

DUT1 = UT1 - UTC

DUT1 is maintained in the range -0.9 s < DUT1 < +0.9 s by introducing a leap second into UTC roughly every 18 months. Forecast values of DUT1 are published in IERS [Bulletin A].

The reason for this correction is that the rate of rotation of the Earth is not constant, due to tidal braking and small effects from earthquakes.

 

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