This year will last a second longer than usual

Scientists have determined that after roughly 500 to 750 days, the difference between Earth rotation time and atomic time would be about one second.

The International Earth Rotation and Reference Systems Service (IERS) is the organisation which monitors the difference in the two time scales and calls for leap seconds to be inserted in or removed from UTC when necessary to keep them within 0.9 seconds of each other.

When the system was instituted in 1972, the difference between International Atomic Time and UTC was determined to be 10 seconds.

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