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Commissions

Activities in the various astronomical sub-disciplines are mostly conducted by Commissions, coordinated through the IAU Scientific Divisions, acting as umbrellas for one or more IAU Commissions.

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

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