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Published online by Cambridge University Press: 12 April 2016
The principal purpose of IAU Colloquium No. 9 on the IAU System of Astronomical Constants was to discuss whether further action should be taken to revise those fundamental constants (namely the constants of precession and nutation and the system of planetary masses) that were left unchanged when new values of the other constants were adopted at Hamburg in 1964. The opportunity to discuss other relevant matters was also taken.