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Just One Second!

Photonics Spectra
Jul 1997
To keep the world's atomic clocks synchronized with the Earth's rotation, the National Institute of Standards and Technology's Time and Frequency Div. added a "leap" second June 30. This is the 21st adjustment to the world's time scale since 1972 when leap seconds were first added. The planet loses several thousandths of a second each day, which necessitates leap seconds.

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