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leap second

The leap second is the one second added to Coordinated Universal Time (UTC) each year on the last day of June and/or December. This coordinates UTC time with astronomical time, whose reference is Greenwich Mean Time

(GMT). The International Earth Rotation Services (IERS) initiates the addition of the leap second whenever Greenwich meridian

is crossed by more than 0.9 s. Leap seconds were introduced in 1972 after astronomical time and TAI time had already diverged by more than 10 seconds since their introduction in 1958. Since 1972, a total of 32 leap seconds have been inserted.

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Englisch: leap second
Updated at: 05.08.2007
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