Welcome to the NavList Message Boards.


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

Compose Your Message

Add Images & Files
    Decoupling Civil Timekeeping from Earth Rotation
    From: Greg R_
    Date: 2011 Jun 28, 10:36 -0700

    A Colloquium Exploring Implications of Redefining UTC in Astrodynamics,
    Astronomy, Geodesy, Navigation, Remote Sensing and Related Fields to be held
    at the Headquarters of Analytical Graphics, Inc., Exton, PA, October 5-6,
    Universal Time - the conventional measure of Earth rotation and astronomical
    time-of-day - is the traditional basis for civil timekeeping worldwide.
    Since 1972, Coordinated Universal Time (UTC) has remained a broadcast
    convention for labeling uniform atomic seconds so that civil clocks remain
    synchronized with Universal Time of day to better than one second. Because
    UTC began with radio broadcasts, its prescription has been maintained by the
    Radiocommunications Sector of the International Telecommunications Union
    A conclusive proposal to fundamentally redefine UTC is scheduled for a vote
    by the Radiocommunications Assembly of the ITU-R in January, 2012. The
    proposal will halt the contribution of so-called leap seconds to UTC after
    2017, and will also terminate the requirement that time services transmit
    the difference between UT1 and UTC. If approved, UTC would no longer be
    useful as a type of Universal Time for most technical applications.
    Many software and hardware systems needing to know how the Earth is oriented
    with respect to the sky rely on UTC for this purpose. Should UTC be
    redefined, significant consequences may be anticipated for applications and
    infrastructures across various fields. Applications that do not apply
    so-called Earth Orientation Parameters and/or DUT1 corrections to UTC would
    be most affected.
    Sessions will cover diverse topics of pragmatic timekeeping in a possibly
    changing world.
    For additional information, email: info(AT)futureofutc.org.

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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