Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: no leap second coming in December
    From: Andr?s Ruiz
    Date: 2004 Jul 27, 16:20 +0200
    Mensaje


    I E R S   B U L L E T I N - A
    http://maia.usno.navy.mil/
    Delta T = 32.184 s + (TAI - UTC) - (UT1 - UTC)
    2004 [ser7.dat]
    (TAI - UTC) = 32 s
    DUT1= (UT1-UTC) = -0.5 s
    Delta T = 64.684

    -----Mensaje original-----
    De: Navigation Mailing List [mailto:NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM] En nombre de George Huxtable
    Enviado el: martes, 27 de julio de 2004 10:52
    Para: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    Asunto: Re: [NAV-L] no leap second coming in December


    On 24 July Paul Hirose wrote-

    >A few days ago the IERS announced there would be no leap second at the
    >end of this year. We will have a record-setting run of six consecutive
    >years with no leap second. The previous longest break was 1986 and
    >1987.
    >
    >At present UT1 is .46 second behind UTC. The offset is predicted to be
    >.49 second at the end of the year, and .52 second in mid-2005.

    Does this imply, then, that delta-T, the difference between universal time and ephemeris time, has remained "stuck" at a constant, or nearly-constant value, over that period of six years? If so, what vaue has it stuck at?

    And if so, does anyone understand the geophysical causes that have resulted in the slowing of the Earth's rotation, which has been so consistent over the last 80 years or so, to suddenly switch off, 6 years ago?

    Or have I misunderstood something completely?

    George.

    ================================================================
    contact George Huxtable by email at george---.u-net.com, by phone at 01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. ================================================================

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site