Activities in the various astronomical sub-disciplines are mostly conducted by Commissions, coordinated through the IAU Scientific Divisions, steering the activities and evolution of one or more IAU Commissions.

The list below is that of the current Commissions, which will disappear at the end of the 2015 General Assembly in Honolulu. To replace them, a Call for Proposals for Commissions has been issued on June 15 (see and the enclosed links to the Submission Form, procedure, etc.), with Letters of Intent due on Oct.15.

Commission Division
C 4 Ephemerides A
C 5 Documentation & Astronomical Data B
C 6 Astronomical Telegrams B
C 7 Celestial Mechanics & Dynamical Astronomy A
C 8 Astrometry A
C 10 Solar Activity E
C 12 Solar Radiation & Structure E
C 14 Atomic & Molecular Data B
C 15 Physical Study of Comets & Minor Planets F
C 16 Physical Study of Planets & Satellites F
C 19 Rotation of the Earth A
C 20 Positions & Motions of Minor Planets, Comets & Satellites F
C 21 Galactic and Extragalactic Background Radiation J
C 22 Meteors, Meteorites & Interplanetary Dust F
C 25 Astronomical Photometry and Polarimetry B
C 26 Double & Multiple Stars G
C 27 Variable Stars G
C 28 Galaxies J
C 29 Stellar Spectra G
C 30 Radial Velocities A
C 31 Time A
C 33 Structure & Dynamics of the Galactic System H
C 34 Interstellar Matter H
C 35 Stellar Constitution G
C 36 Theory of Stellar Atmospheres G
C 37 Star Clusters & Associations H
C 40 Radio Astronomy B
C 41 History of Astronomy C
C 42 Close Binary Stars G
C 44 Space & High Energy Astrophysics D
C 45 Stellar Classification G
C 46 Astronomy Education & Development C
C 47 Cosmology J
C 49 Interplanetary Plasma & Heliosphere E
C 50 Protection of Existing & Potential Observatory Sites B
C 51 Bio-Astronomy F
C 52 Relativity in Fundamental Astronomy A
C 53 Extrasolar Planets (WGESP) F
C 54 Optical & Infrared Interferometry B
C 55 Communicating Astronomy with the Public C

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IAU General Assembly
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