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For any of you interested in timing on the network or who need super accurate time the following information may be useful.
On July 4 of this year the International Earth Rotation and Reference Systems Service (IERS), the organization responsible for measuring the relationship between UTC (Coordinated Universal Time) and the rate of Earth’s rotation, sent out Bulletin C30 announcing that a positive leap second would be introduced at the end of December 2005.
This leap second will be added by the world’s timekeepers on December 31, 2005. The leap second insertion increases the length of the last minute of the UTC day to 61 seconds. The sequence of dates of the UTC second markers will be:
·2005 December 31, 23h 59m 59s
·2005 December 31, 23h 59m 60s
·2006 January 1, 0h 0m 0s
Reason for the Leap Second
The reason for leap seconds is to make atomic clock based UTC agree with earth time based UT1 within 0.9 second. UT1is based on the rate of rotation of the earth as determined by astronomical observations. Leap seconds are needed to keep the two time scales in agreement since the earth’s rotational rate is slowly decreasing by approximately 1.4 milliseconds per century due to effects such as tidal braking. Atomic clock based time scales are also much more stable than the daily rotational rate of the earth by about one million times.
Leap seconds don’t happen every year, but only when needed. The last one was on December 31, 1998.
I guess this means we all adjust our watches on 31 Dec
There will be a "leap second" on 31 Dec
Linear Mode
