Pocket watch, savonette-type. (Image Source: Wikipedia.org ; Photograph by Isabelle Grosjean)
By Glenn A. Walsh
Reporting for SpaceWatchtower
On Tuesday evening, our clocks will slow down by a second, to match the slowing of the rotation rate of the Earth. At 7:59:59 p.m. Eastern Daylight Saving Time (EDT) / 23:59:59 Coordinated Universal Time (UTC) on Tuesday Evening, 2015 June 30, an additional second will be added to the civil time scale just before the month of July officially begins according to Coordinated Universal Time, the international time scale used by many scientists.
Known as a “Leap Second,” one second is added to the time scale, periodically, either at the very end of June or the very end of December. Since the first Leap Second was added in 1972, 25 Leap Seconds have been added, the last one in June of 2012.
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Source: Glenn A. Walsh Reporting for SpaceWatchtower, a project of Friends of the Zeiss.
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