Wednesday, December 14, 2011

When and why in a minute may be 61 seconds?

To Coordinated Universal Time rather consistent with the mean solar time in some years by 30 June or 31 December International Earth Rotation Service adds an extra second, which is also called a leap year. In those days, after first going 23:59:59 23:59:60, 00:00:00 and then later the next day.

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