– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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International Astronomical Union (IAU)

The mission of the International Astronomical Union (IAU) is to promote and safeguard the science of astronomy in all its aspects through international cooperation. Among the tasks of the IAU are the definition of fundamental astronomical and physical constants, and unambiguous astronomical nomenclature.

Interests common to the BIPM and the IAU include the time scales for the description of dynamical systems, the development and application of the theory of general relativity in the field of time and the use of pulsar data for the realization of a dynamic time scale.

Links between the BIPM and the IAU:

  • The IAU participates in the CCTF and the CCU.
  • Members of staff of the BIPM are active members of the IAU and participate in IAU commissions and working groups.
  • Dr Gérard Petit (BIPM Time Department) is a member of Division A (Fundamental Astronomy), of its Working Groups on Numerical Standards in Fundamental Astronomy and on Time Metrology Standards, and a member of the Commissions A2 (Rotation of the Earth) and A3 (Fundamental Standards).
  • BIPM Time Department is active within the Division A (Fundamental Astronomy) as a member of its Steering Committee, chair of its Working Group on Time Metrology Standards, and a member of its Working Group on the Third Realization of the International Celestial Reference Frame.

BIPM contact(s):
IAU contact(s):
  • Dr Dennis McCarthy, IAU delegate to the CCTF
  • Dr Nicole Capitaine, IAU delegate to the CCU