The Earth, can sin of delay. Because of gravitational effects of the moon in fact, the speed of rotation of the Earth can vary. And ‘for this reason that the last minutes of the June 30, 2012, will start at 23:59 instead of 23:59 and 60 seconds and 59 seconds.
This type of correction is called ‘leap second’ and serves to synchronize the clock of the ‘astronomical time’ with the artificial Earth hours, punctuated by atomic clocks (UTC). To determine when it is necessary to introduce the ‘leap second’, is the International Earth Rotation and Reference Systems Service (IERS). Every time you close the gap to 0.9 seconds, this institution renews the need to ‘adjust the clocks’. Generally, the change takes place or at the last minute of June 30 or December 31.
The introduction of the ‘leap second’, has no regular or exact duration depends frequanza because of rotation of the Earth, which is also irregular.
-K A Solaman
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