************************************************************************ IERS Message No. 534 May 23, 2025 ************************************************************************ Third update of the 2020 C04 solution Following a decision taken during the IERS DB #80 in Vienna, Austria, the pole coordinates (xp, yp) and their rates (xrt, yrt) will be updated for the period 1/1/2021 - 24/2/2024 by taking the values corresponding to the ITRF2020-u2023. This change will eliminate systematic effects coming from the IGS finals solution, which was not fully recalculated in the ITRF2020 solution over this period. The name of the updated series will remain unchanged as well as their path: https://hpiers.obspm.fr/iers/eop/eopc04 Values for (xp, yp) and (xrt, yrt) sampled at 12h UTC are exactly those of ITRF2020-u2023, whereas values at 0h result from a Lagrange interpolation. The change will be effective from June 5, 2025 (Thursday). The former solution will be archived in the repository: https://hpiers.obspm.fr/iers/eop/eopc04_20_v2 Beyond June 5, 2025 these series will no longer have any future updates. -- Christian Bizouard Service International de la Rotation de la Terre et des Systemes de References IERS EOP Center Observatoire de Paris / LTE (Laboratoire Temps Espace) 77 av. Denfert-Rochereau 75014 Paris tel: +33140512335 http://iers.obspm.fr/eop-pc ************************************************************************ IERS Messages are edited and distributed by the IERS Central Bureau. If not stated otherwise, the IERS is only the distributor of the message and is not responsible for its content. To submit texts for distribution, please write to . To subscribe or unsubscribe, please create an IERS account or modify it: https://www.iers.org/Login/Login/EN/login_node.html or write to . Archives: http://www.iers.org/IERS/Messages ************************************************************************