No leap second to be added at end of December 2026, IERS confirms

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The International Earth Rotation and Reference Systems Service (IERS) has confirmed that no leap second will be introduced at the close of December 2026. The announcement was made via the organization's official Bulletin C, which is the standard publication used to communicate leap second decisions. Leap seconds are occasionally added to Coordinated Universal Time (UTC) to account for irregularities in Earth's rotation. The decision means UTC will remain unadjusted at the end of 2026, keeping atomic time and astronomical time aligned without any additional correction.

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