[CESG] IERS Questionnaire to survey opinion concerning a redefinition of UTC

Gian.Paolo.Calzolari at esa.int Gian.Paolo.Calzolari at esa.int
Wed Jul 20 10:20:52 EDT 2011

Dear All,
        I wonder whether you are aware of this ongoing activity and of any 
ongoing position/evaluation within your space agency.

I think that any change for UTC would affect (at least) CCSDS 301.0-B-4 
"TIME CODE FORMATS" where it is stated that the "UTC based codes" (i.e. 
CDS, CCS, ASCII) do require the leap second correction.

Best regards

Gian Paolo


IERS Message No. 192                                       July 12, 2011

Questionnaire to survey opinion concerning a redefinition of UTC

After years of discussions, a proposal to fundamentally redefine UTC
will come to a conclusive vote in January 2012 at the ITU-R in Geneva.
This proposal would halt the intercalary adjustments known as leap
seconds that maintain UTC as a form of Universal Time.

If the proposal is approved, UTC would not keep pace with Earth rotation
and the value of DUT1 would become unconstrained. Therefore UTC would no
longer be directly useful for various technical applications which rely
on it being less than 1 second from UT1. Such applications would require
a separate access to UT1, such as through the publication of DUT1 by
other means.

The objective of the survey is to find out the strength of opinion for
maintaining or changing the present system.

Link to the questionnaire:


Your response is appreciated before 31 August 2011.

Daniel Gambis
Earth Orientation Center of the IERS

IERS Messages are edited and distributed by the IERS Central Bureau.
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please write to <central_bureau at iers.org>.
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