LEAP SECOND TO BE INTRODUCED BY THE END OF THE YEAR & LEAP SECOND TALKS POSTPONED
November 21, 2005
LEAP SECOND TO BE INTRODUCED BY THE END OF THE YEAR
Reprinted below is the U.S. Naval Observatory Time Series Announcement Series 14.
U.S. NAVAL OBSERVATORY WASHINGTON, D.C. 20392-5420
July 27, 2005 No. 69
TIME SERVICE ANNOUNCEMENT SERIES 14
UTC TIME STEP
1. The International Earth Rotation and Reference Systems Service
(IERS) has announced the introduction of a time step to occur at the end of
December, 2005.
2. Coordinated Universal Time (UTC) will be retarded by 1.0s so that
the sequence of dates of the UTC markers will be:
2005 December 31 23h 59m 59s
2005 December 31 23h 59m 60s
2006 January 01 0h 0m 0s
3. The difference between UTC and International Atomic Time (TAI) is:
from 1999 01 Jan, UTC to 2006 01 January, UTC: TAI-UTC= +32s
from 2006 01 Jan, UTC until further notice: TAI-UTC= +33s
4. Information regarding current and predicted values of UT1-UTC is
provided in IERS Bulletin A.
5. UTC and all time scales based on UTC will be affected by this
adjustment. However, Loran-C and GPS will not be adjusted physically. Times of
Coincidence for LORAN-C are available on the Time Service Web Page
( http://tycho.usno.navy.mil/loran.html ). For GPS, the leap second correction
contained within the UTC data of subframe 4, page 18 of the navigation
message transmitted by satellites will change.
Before the leap second
GPS-UTC = +13s (i.e., GPS is ahead of UTC by thirteen seconds)
After the leap second
GPS-UTC = +14s (i.e., GPS will be ahead by fourteen seconds)
===============================================================================
November 21, 2005
LEAP SECOND TALKS POSTPONED
The controversial adjustment of UTC by leap seconds will continue. Scientists
expert on timekeeping have decided to postpone any changes to the current
application of leap seconds until more studies are performed.
Read full press release at:
http://news.bbc.co.uk/1/hi/sci/tech/4420084.stm
.
Relevant Pages
- Re: Gentlemen [and ladies] restart your UTC clocks!
... The International Earth Rotation and Reference Systems Service (IERS) ... Coordinated Universal Time (UTC) will be retarded by 1.0s so that the ...
(rec.radio.shortwave) - Re: Extra leap seconds due to earthquake?
... > internationally-agreed extra leap second or seconds that are sometimes ... > On the GPS front, I think that GPS internal system time (UTC as at ... > satellites) is now 13 seconds ahead of today's UTC, ... It is expected that Celestial Pole offsets related to the IAU1980 Nutation ...
(sci.geo.satellite-nav) - Re: C1X calendar and long time proposals
... > longtime_t values differ by one second's worth of ticks, i.e., the ... epoch", without any leap second magic, so that the difference ... regardless of the time scale (TAI or UTC or TDB or..). ...
(comp.std.c) - Re: Extended-Range Time Type
... since UTC midnight of the current day can be done in ISO C, ... First because "the current day" within ISO C will force you to ... if that day happens to have a leap second (would be Jun or Dec ... determinability of the local timezone, and that the timezone has a integer ...
(comp.std.c) - Re: Julian Date and Leap Seconds
... The length of of UTC day is not constant. ... except when a leap second is needed. ... strictly uniform time scale so it's bound to drift away from ... time scales that are uniform unless periodic corrections are ...
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