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Earth's changing spin is threatening to toy with our sense of time in an unprecedented way—but only for a second. For the first time in history, world timekeepers may...

Scientists at the NPL celebrate the first inclusion of a UK optical clock - the Sr1 strontium optical lattice clock - in the determination of International Atomic Time (TAI). Scientists at the National Physical Laboratory (NPL) are celebrating the achievement of a milestone with the first inclusion of a UK optical clock - the Sr1 strontium optical lattice clock - in the determination of International Atomic Time (TAI).

Britain’s National Physical Laboratory is celebrating a major achievement by its scientists with the inclusion of a UK optical clock in the determ...

A major milestone towards the redefinition of the second has been achieved by scientists at the National Physical Laboratory (NPL) with the first inclusion of a UK optical frequency standard (NPL-Sr1) in the determination of International Atomic Time (TAI).

The world's timekeepers balance ultra-precise atomic clocks with the irregular spin of our planet to come up with the world clock.