The Earth does not rotate as evenly as atomic clocks expect. Drifting ice masses, changing wind patterns and tidal forces shift the planet's rotational momentum, which changes the rotational speed by more than a second year after year. For global systems that depend on the precision of atomic clocks, such a deviation can become a problem. In October, the 28th General Conference on Measurement and Weight (CGPM) in Versailles decides on a proposal…
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The Earth does not rotate as evenly as atomic clocks expect. Drifting ice masses, changing wind patterns and tidal forces shift the planet's rotational momentum, which changes the rotational speed by more than a second year after year. For global systems that depend on the precision of atomic clocks, such a deviation can become a problem. In October, the 28th General Conference on Measurement and Weight (CGPM) in Versailles decides on a proposal…