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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Commissions

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