No. 7 September 2013

Coordinated Universal Time (UTC) and the leap second

The future of time –
To abolish or not to abolish the leap second?:

Editorial
Keeping the world’'s time –
ITU leading international cooperation

Dr Hamadoun I. Touré, ITU Secretary‑General

The future of time –
To abolish or not to abolish the leap second?|1

The future of time –
To abolish or not to abolish the leap second?:

Foreword
Modern times –– Is the leap second history?

François Rancy, Director, ITU Radiocommunication Bureau

The future of time –
To abolish or not to abolish the leap second?|1

The future of time –
To abolish or not to abolish the leap second?:

The past and future of Coordinated Universal Time

Ronald Beard, Chairman, ITU––R Working Party 7A

The future of time –
To abolish or not to abolish the leap second?|1

The future of time –
To abolish or not to abolish the leap second?:

Time-scales and the International Bureau of Weights and Measures

Elisa Felicitas Arias, Director, Time Department, International Bureau of Weights and Measures (BIPM)

The future of time –
To abolish or not to abolish the leap second?|1

The future of time –
To abolish or not to abolish the leap second?:

Leap seconds
Role of the International Earth Rotation and Reference Systems Service

Brian Luzum, Chair, Directing Board, International Earth Rotation and Reference Systems Service

The future of time –
To abolish or not to abolish the leap second?|1

The future of time –
To abolish or not to abolish the leap second?:

The International Astronomical Union and Coordinated Universal Time
Blue sky thinking

Mizuhiko Hosokawa, President of IAU’s Commission 31 on Time, Japan'’s National Institute of Information and Communications Technology

The future of time –
To abolish or not to abolish the leap second?|0

The future of time –
To abolish or not to abolish the leap second?:

Geosciences and international time-scales
Status of the discussions at the International Union of Geodesy and Geophysics

Claude Boucher, International Union of Geodesy and Geophysics representative to the Consultative Committee for Time and Frequency

The future of time –
To abolish or not to abolish the leap second?|0

The future of time –
To abolish or not to abolish the leap second?:

What is in a name?
On the term Coordinated Universal Time

David Finkleman, Senior Scientist, Center for Space Standards and Innovation, Colorado, United States; and Kara Warburton Ph.D. Candidate, City University of Hong Kong

The future of time –
To abolish or not to abolish the leap second?|0

The future of time –
To abolish or not to abolish the leap second?:

Global navigation satellite systems and their system times

W. Lewandowski, International Bureau of Weights and Measures

The future of time –
To abolish or not to abolish the leap second?|0

The future of time –
To abolish or not to abolish the leap second?:

Space odyssey
Time-scales and global navigation satellite systems

Han Chunhao, Beijing Satellite Navigation Center

The future of time –
To abolish or not to abolish the leap second?|0

The future of time –
To abolish or not to abolish the leap second?:

Galileo and Coordinated Universal Time leap seconds

Jörg Hahn, ESA/ESTEC, Galileo System Engineering Manager

The future of time –
To abolish or not to abolish the leap second?|0

The future of time –
To abolish or not to abolish the leap second?:

GLONASS and Coordinated Universal Time

Igor V. Zheltonogov, D. Aronov and S. Sorokin, Geyser-Telecom, Russian Federation

The future of time –
To abolish or not to abolish the leap second?|0

The future of time –
To abolish or not to abolish the leap second?:

Impact of leap seconds on digital time services
Internet time servers

Judah Levine, Time and Frequency Division, United States National Institute of Standards and Technology

The future of time –
To abolish or not to abolish the leap second?|0

The future of time –
To abolish or not to abolish the leap second?:

A British perspective of the future of Coordinated Universal Time

Peter Whibberley, Senior Research Scientist, Time and Frequency Group, National Physical Laboratory, United Kingdom

The future of time –
To abolish or not to abolish the leap second?|0

The future of time –
To abolish or not to abolish the leap second?:

Impact of the leap second on Japan'’s time-stamp system

Koichi Shibata, Time Business Forum

The future of time –
To abolish or not to abolish the leap second?|0
François Rancy, Director, ITU Radiocommunication Bureau

Foreword
Modern times –– Is the leap second history?

François Rancy, Director, ITU Radiocommunication Bureau
The past and future of Coordinated Universal Time

The past and future of Coordinated Universal Time

Ronald Beard, Chairman, ITU––R Working Party 7A
Elisa Felicitas Arias

Time-scales and the International Bureau of Weights and Measures

Elisa Felicitas Arias, Director, Time Department, International Bureau of Weights and Measures (BIPM)
LCD clock displaying an inserted leap second before midnight in the 24-hour time system. The last leap second was added on 30 June 2012

Leap seconds
Role of the International Earth Rotation and Reference Systems Service

Brian Luzum, Chair, Directing Board, International Earth Rotation and Reference Systems Service

Celebrating ITU’s 150 Years

In this issue
No.6 November | December 2015

Pathway for smart sustainable cities:

A guide for city leaders

Pathway for smart sustainable cities|1

Meeting with the Secretary-General:

Official Visits

Meeting with the Secretary-General|1
Latest headlines

What is in a name?
On the term Coordinated Universal Time

David Finkleman, Senior Scientist, Center for Space Standards and Innovation, Colorado, United States; and Kara Warburton Ph.D. Candidate, City University of Hong Kong

Galileo and Coordinated Universal Time leap seconds

Jörg Hahn, ESA/ESTEC, Galileo System Engineering Manager

GLONASS and Coordinated Universal Time

Igor V. Zheltonogov, D. Aronov and S. Sorokin, Geyser-Telecom, Russian Federation

Impact of leap seconds on digital time services
Internet time servers

Judah Levine, Time and Frequency Division, United States National Institute of Standards and Technology