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    The Future of UTC Leap Seconds (fwd)
    From: Richard B. Langley
    Date: 2005 Jul 5, 09:38 -0300

    More on the future of UTC leap seconds.
    -- Richard Langley
    
    ===============================================================================
     Richard B. Langley                            E-mail: lang@unb.ca
     Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
     Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142
     University of New Brunswick                   Fax:      +1 506 453-4943
     Fredericton, N.B., Canada  E3B 5A3
         Fredericton?  Where's that?  See: http://www.city.fredericton.nb.ca/
    ===============================================================================
    
    ---------- Forwarded message ----------
    Date: Tue, 5 Jul 2005 09:34:28 -0300
    From: Richard Langley 
    To: CANSPACE@listserv.unb.ca
    Subject: The Future of UTC Leap Seconds
    
    July 2005
    Letter to IERS Bulletins C and D users
    
    Dear colleague,
    
    As you are probably aware, international discussions are in progress on a
    redefinition of UTC, including a possible suppression of the leap seconds
    procedure.
    
    To reply to the request of several international organizations on a possible
    evolution of UTC the International Telecommunication Union, ITU decided in
    October 2000 the creation of a Working Group called "Special Rapporteur
    Group", SRG chaired by Mr Ron Beard of the Naval Research Laboratory (NRL-
    USA), in charge of studying by a large consultation the different possible
    solutions. The SRG reports its conclusions to the ITU working party WP-7A.
    
    The Special Rapporteur Group (SRG) organized a colloquium in Torino, Italy in
    May 2003. No general agreement emerged from this colloquium.
    
    In parallel, the US delegation to the WP-7A submitted, at the last meeting in
    Geneva in October 2004, a proposal which contained the following items:
    
    1 - Maintenance of a time scale called UTC.
    
    2 - Suppression of the leap seconds adjustments which maintains UTC close to
    UT1, a time scale based on the Earth's rotation (currently UT1-UTC < .9 s)
    
    3 - The difference of UT1 from UTC should not exceed 1 hour.
    
    4 - The change should take effect at 21 December 2007, 00:00 UTC
    
    If your activity is affected by the content of the US proposal which will be
    discussed in November 2005 at the WP-7A, you are urged to react. This could be
    the last opportunity before a recommendation is issued by the WP-7A.
    
    If you wish you can express your opinion to your representative(s) at the
    WP-7A of ITU (for the list see the ITU website, http://www.itu.int/home/
    index.html) with a copy to Daniel Gambis (daniel.gambis@obspm.fr), IERS EOP
    Center.
    
    Daniel Gambis
    Head
    Earth Orientation Center of the IERS
    Observatoire de Paris
    
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