Activities in the various astronomical sub-disciplines are mostly coordinated through the IAU Divisions.

Following the adoption of the Executive Committee Resolution at the XXVIIIth General Assembly held in Beijing, a new Division scheme has been put into place, to take into account the evolution of astronomy and to reflect the scientific policy of the IAU.

These Divisions will include one or more IAU Commissions, each focusing on a narrower scientific or organizational theme. The relation between the existing Commissions and the new Divisions will be gradually established in the coming months.

The list of Divisions adopted in Beijing is as follows:

This list supersedes the previous list of Divisions,which we recall below for reference. The Division names may slightly evolve as the new structure is implemented. Div. A Fundamental Astronomy is named "Space and Time Reference Frames" in the Resolution.

  • Division I Fundamental Astronomy
  • Division II Sun & Heliosphere
  • Division III Planetary Systems Sciences
  • Division IV Stars
  • Division V Variable Stars
  • Division VI Interstellar Matter
  • Division VII Galactic System
  • Division VIII Galaxies & the Universe
  • Division IX Optical & Infrared Techniques
  • Division X Radio Astronomy
  • Division XI Space & High Energy Astrophysics
  • Division XII Union-Wide Activities

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