An employee at the Electric Time Company plant in in Medfield, Mass., cleans the face of an 84-inch Wegman clock. At the close of June 30, clocks internationally will be set back one second. The leap second will align timepieces with atomic clocks, which are pegged to oscillations of a cesium-133 atom, instead of Earth rotation.
An employee at the Electric Time Company plant in in Medfield, Mass., cleans the face of an 84-inch Wegman clock. At the close of June 30, clocks internationally will be set back one second. The leap second will align timepieces with atomic clocks, which are pegged to oscillations of a cesium-133 atom, instead of Earth rotation. 2008 AP FILE PHOTO 2008 AP FILE PHOTO
An employee at the Electric Time Company plant in in Medfield, Mass., cleans the face of an 84-inch Wegman clock. At the close of June 30, clocks internationally will be set back one second. The leap second will align timepieces with atomic clocks, which are pegged to oscillations of a cesium-133 atom, instead of Earth rotation. 2008 AP FILE PHOTO 2008 AP FILE PHOTO

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Ready for the June 30 leap second?

June 21, 2015 4:00 PM

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