Various special-interest groups exist within the Society to coordinate the activities of special interest groups, which are divided into three broad categories: observing sections (Shallow Sky, Deep-Sky, Comets Asteroids & Meteor, and Photometry & Spectroscopy), theoretical sections (Cosmology and Astrophysics), and other sections (Historical, Dark Sky, Astrophotography, and Instrumentation). Find out more about the work of the Sections: