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Coordinated Universal Time to Retain Leap Second – ITU

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Houlin Zhao. ITU Secretary-General
Houlin Zhao. ITU Secretary-General

    By: Linda Kabuzire

  • Nov 20,2015
  • 1010 Viewed

The ITU World Radio communication Conference (WRC-15), currently in session in Geneva has decided that further studies are required on the impact and application of a future reference time-scale, including the modification of coordinated universal time (UTC) and suppressing the so-called “leap second”.

According to the International Telecommunication Union(ITU), Leap seconds are added periodically to adjust to irregularities in the earth’s rotation in relation to Coordinated Universal Time (UTC), the current reference for measuring time, in order to remain close to mean solar time

A leap second was added most recently on June 30, 2015 at 23:59:60 UTC. The proposal to suppress the leap second would have made continuous reference time-scale available for all modern electronic navigation and computerised systems to operate while eliminating the need for specialized ad hoc time systems.

The decision by WRC-15 calls for further studies regarding current and potential future reference time-scales, including their impact and applications.

“A report will be considered by the World Radio communication Conference in 2023.

WRC-15 also calls for reinforcing the links between ITU and the International Bureau of Weights and Measures (BIPM).

ITU would continue to be responsible for the dissemination of time signals via radio communication and BIPM for establishing and maintaining the second of the International System of Units (SI) and its dissemination through the reference time scale.

Studies will be coordinated by ITU along with international organisations such as the International Maritime Organisation (IMO), the International Civil Aviation Organisation (ICAO), the General Conference on Weights and Measures (CGPM), the International Committee for Weights and Measures (CIPM), the International Bureau of Weights and Measures (BIPM), the International Earth Rotation and Reference Systems Service (IERS), the International Union of Geodesy and Geophysics (IUGG), the International Union of Radio Science (URSI), the International Organisation for Standardisation (ISO), the World Meteorological Organisation (WMO), and the International Astronomical Union (IAU).

“Modern society is increasingly dependent on accurate timekeeping,” said ITU Secretary General, Houlin Zhao.

“ITU is responsible for disseminating time signals by both wired communications and by different radio communication services, both space and terrestrial, which are critical for all areas of human activity,”Zhao added.

“The worldwide coordination of time signals is critical for the functioning and reliability of systems that depend on time,” said François Rancy, Director of the ITU Radio communication Bureau.

According to Rancy, ITU will continue to work with international organisations, industry and user groups towards providing coherent advice on current and potential future reference time-scales.


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