Bureau International des Poids et Mesures
US Naval Observatory
IERS Conventions Center

The version of the IERS Conventions presented below is a working version.  It is under development and is not definitive nor officially approved as a registered edition.  However, it contains all corrections to the IERS Conventions (2010) that have been identified.

• Introduction: Not updated
• Chapter 1- General definitions and numerical standards:  Not updated
• Chapter 2- Conventional celestial reference system and frame: Not updated
• Chapter 3- Conventional dynamical realization of the ICRS:  Not updated
• Chapter 4- Terrestrial reference systems and frames:  Not updated
• Chapter 5- Transformation between the International Terrestrial Reference System and Geocentric Celestial Reference System:  Last updated 10 August 2012
  
• Chapter 6- Geopotential:  Last updated 10 August 2012
• Chapter 7- Displacement of reference points: Last updated 10 June 2013
  Main planned and possible changes:
  • New section on non-tidal displacement of reference markers
  • Section on models for displacement of reference points of instruments rewritten. [Started 10 February 2009]
• Chapter 8- Tidal variations in Earth's rotation: Last updated 22 December 2011
  Main planned and possible changes:
  • Review of the model for diurnal and semi-diurnal EOP variations
• Chapter 9- Models for atmospheric propagation delays: Last updated 10 June 2013
• Chapter 10- General relativistic models for space-time coordinates and equations of motion: Not updated
• Chapter 11- General relativistic models for propagation: Not updated
  Main planned and possible changes:
  • Revised section on ranging techniques
    
• Appendices: Last updated 15 January 2013
  
• Glossary: Last updated 22 December 2011
  

• For each chapter, this page provides access to the latest update of the text and software, and to a list of update changes since the last approved version, the IERS Conventions (2010). For all files subject to changes, previous versions are kept on the ftp site and identified by adding a date of validity to the filename (see an example in Chapter 5). In addition a complete list of updates is available here.
• For each chapter of the Conventions, the page provides access to the Latex source file and, if applicable, the figures in encapsulated postscript format. To typeset, other tex and style files are necessary, they may be found here. The printable version of each chapter is also provided in pdf format. When applicable, subroutines or other auxiliary files are also included.
• For all updates, the changes with respect to IERS Conventions (2010) are outlined with a line in the external margin and the date of the update. New sections are identified with a thicker line in the external margin next to their title. Note: To typeset the tex file, you need tn-settings.tex.