IERS Conventions (2010) Packaged Content



  • Descriptions of changes made in each version is listed below the given version.
  • Each version contains all chapters, software, and supporting materials.
  • Refer to the included CHANGELOG.md file in each downloaded package to identify the history of modifications made to each version.



  • v 1.2.0
    • 28 December 2018:
      • The Conventions has replaced the concept of the mean pole with the secular pole in Chapters 6 & 7.
      • Definition of secular pole has been added to the Glossary.
      • IERS_CMP_2015.F has been removed from Chapter 7, as the Conventions no longer supports the mean pole
      • CALC2JD.F subroutine has been renamed to correspond to subroutine called in DAT.F (Chapter 7).
    • 1 February 2018:
      • Reference to mean pole in Chapter 6 has been replaced with mean figure axis.
      • Other minor changes to the text in Chapter 6, Section 6.1.
      • Section 7.1.4 in Chapter 7 has been rewritten to include the secular pole and remove the former mean pole.

  • v 1.1.0
    • 16 November 2017
      • In Chapter 1, Table 1.1, the W0 value has been modified to correspond to the value adopted in the IAG 2015 Resolution (No. 1).
    • 31 March 2017:
      • In Section 7.1.4 of Chapter7 (pg. 16) of chapter text, the last point of observed mean pole values has been corrected to read "epoch (YYYY-1).0". It had been previously written as "YYYY.0".
    • 20 December 2016:
      • In Chapter 7, to account of the leap second occurring on 31 December 2016:
        • The program HARDISP.F and its subroutine ETUTC.F, were updated.
        • The subroutine DEHANTTIDEINEL.F and its subroutine from the SOFA package, DAT.F were updated.
      • Other Changes:
        • An updated CAL2JD.F, a subroutine of DEHANTTIDEINEL.F, was added from the 12th release of the SOFA package.
    • 19 June 2015:
      • In Chapter 7, the program HARDISP.F, its subroutine ETUTC.F, the subroutine DEHANTTIDEINEL.F and its subroutine from the SOFA package, DAT.F, were updated to account of the leap second occurring on 30 June 2015.
      • Corrected Errors:
        • Two subroutines of the HARDISP.F package have been corrected for bugs and the test cases of all affected routines have been subsequently modified and completed. The potential error on the HARDISP results is less than 0.1 mm.
          1. Two variables in ETUTC.F have been changed from single to double precision
          2. Error in number of seconds/day in the subroutine TDFRPH.F has been corrected. A new test case utilizing non-zero time has been added.
        • The test case has been modified in HARDISP.F to utilize non-zero time and correct for the change to double precision in ETUTC.F
        • Previously missing data in the test run of the ocean pole tide model was added. An explanatory sentence has been added to section 7.1.5, "Ocean pole tide loading."
        • Typos present in the text of the Conventions (2010), have been corrected in the paragraph following Table 7.1 and in Section 7.1.5.
      • Other changes:
        • A new version of the IERS Conventional Mean Pole (CMP) is realized in the IERS subroutine, IERS_CMP_2015.F. See Section 7.1.4, "Rotational deformation due to polar motion" for more information. The CMP change also affects the computation of the pole tide effects on the geopotential, see Chapter 6.
        • An updated CAL2JD.F, a subroutine of DEHANTTIDEINEL.F, was added from the 11th release of the SOFA package.
    • 21 December 2013:
      • Report the yearly update fcnnut130701 to the Free Core Nutation model in Chapter 5.
    • 10 June 2013:
      • The subroutine DEHANTTIDEINEL.F in Chapter 7 is corrected for a bug that occurred at the update dated 26 March 2012. The potential error is below 0.1 mm.
      • 24 Dec 2013: The Chapter 7 subroutine, TDFRPH.F, used in the HARDISP package, is corrected for an error in the test case. Also, the subroutine TDFRPH2.F has been removed as it was not used.
      • The Chapter 9 subroutine GPT2.F has been updated for consistency with the version at TU Wien. This version ensures proper function at the South pole, and the parameter "dmjd" is no longer modified by the subroutine. A reference has been added in the Chapter 9 text.
    • 15 January 2013:
      • Addition of Appendix E for the IUGG Resolution 3 Adopted at the XXVth General Assembly (2012).
      • Introduced the model Global Pressure and Temperature 2 in Chapter 9 Sections 9.2 "Tropospheric model for radio techniques" and 9.3 "Sources for meteorological data".
      • In the Chapter 9 Section 9.4 "Ionospheric models for radio techniques", some numerical values have been corrected in a number of equations for using exact CODATA (2010) values of fundamental constants. Changes are not significant with respect to the uncertainties of the quantities.
    • 10 August 2012: Changes with respect to previous version of Chapter 5:
      • Report the yearly update fcnnut120701 to the Free Core Nutation model and correct a typo in the value of the FCN period.
      • Changes with respect to previous version of Chapter 9:
        • In the Section 9.2 "Tropospheric model for radio techniques", correct a typo in the Chen and Herring gradient mapping function.
        • In the Section 9.4.1 "Ionospheric delay dependence on radio signals including higher order terms", the part "Ray bending effects on geometric path excess and ionospheric delay" has been updated.
    • 26 March 2012:
      • The following have been modified in Chapter 7 to account for the 30 June 2012 leap second:
        • The program HARDISP.F, its subroutine ETUTC.F, the subroutine DEHANTTIDEINEL.F and its subroutines from the SOFA package DAT.F and CAL2JD.F have been modified to account for the next leap second to occur 30 June 2012.
        • An updated CAL2JD.F, a subroutine of DEHANTTIDEINEL.F, was added from the latest SOFA package. Note that the previous version of DEHANTTIDEINEL.F erroneously did not include the update dated 10 April 2009. This version reinstalls this update (a 0.05 mm effect).
      • The test case provided for the Chapter 9 subroutine VMF1.F has been corrected. The subroutine VMF1_HT.F has been corrected for an error in the computation of the quantity VMF1H and for the test case.
    • 22 December 2011:
      • The subroutine RG_ZONT2.F in Chapter 9 has been corrected for a typo in the sine coefficient of the 365.26 day period for delta LOD. The effect is of the order of a ns over the length of a day.
    • 25 November 2011:
      • The header of the subroutine GPT.F in Chapter 9 has been corrected for the test case output.
    • 14 October 2011:
      • The header of the subroutine PMSDNUT2.F has been corrected to point to the correct section of Chapter 5 and to provide a new test case.
      • Main changes with respect to previous version of Chapter 6:
        • Corrected errors in fes2004_Cnm-Snm.dat: Coefficients for the waves Sa and P1 were computed with an erroneous phase.
        • In Section 6.3.2 "Ocean tide models", part "FES2004", there is an ongoing discussion on the phase of the C20 term of the very long period waves (pi/2 as per the update of 23 September 2011 or -pi/2). A warning sentence has been inserted in the text. The same warning applies to the values in the first two data lines of the files fes2004.dat and fes2004_Cnm-Snm.dat, which remain as in the update of 23 September 2011.
      • The subroutine ARG2.F in Chapter 7 has been corrected to not modify internally the IYEAR argument (the four-digit year).
    • 23 September 2011:
      • Main changes with respect to previous version of Chapter 6:
        • Corrected an error in the file fes2004_Cnm-Snm.dat: The unit of coefficients is 10^-11.
        • In the Section 6.3.2 "Ocean tide models", part "FES2004", the phase of the C20 term of the very long period waves has been corrected to pi/2. The corresponding changes are introduced in the first two data lines of the files fes2004.dat and fes2004_Cnm-Snm.dat.
      • The subroutine ARG2.F in Chapter 7 has been corrected for a bug that caused an error for dates starting with year 2000. Note that the IYEAR argument is now the four-digit year.
    • 13 July 2011:
      • Main changes with respect to previous version of Chapter 5:
        • Correct Tables 5.3a and 5.3b: Column headers misplaced in the "paper" version; One typo in the electronic version.
        • Report an error in the version of Table 5.3b that was published with the Conventions (2003).
        • Correct in Table 5.2f the formula for the polynomial part of Y_IAU 2006 - Y_IAU 2000A.
        • Clarify the text describing the implementation of the IAU 2000A nutation model by the SOFA (Software of Fundamental Astronomy) service.
        • Report the yearly update fcnnut110701 to the Free Core Nutation model.
        • Correct several typos or improper wordings.

  • v 1.0.0 - Official IERS Conventions (2010)
    • 15 December 2010
      • This is the official release of the IERS Conventions (2010).