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Commissions

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.

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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International Year of Astronomy

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