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Earth's Rotation

Factors Affecting Rotation Time Measurement Climate Change Effects Effects of Acceleration Core Dynamics Timekeeping Influences on Rotation Acceleration

Earth Sets Second-Shortest Day of 2025 as Spin Continues to Accelerate

Ruling out a 2025 leap second, international timekeepers prepare protocols for a possible negative adjustment by 2029.

New Projections Confirm Record-Short Days This July and August

Earth Could Set Shortest Day Record in July or August 2025