Photographs must be entered in one of the three sections described below:

A — Natural Sky Phenomena

Any astronomical subject that can be photographed using a camera on a tripod can be entered in this category. This includes star trails, aurora, meteors, satellites, and atmospheric phenomena.

B — Solar System

Any photographs of solar system objects can be entered in this category. This includes the sun, moon, planets, comets, and asteroids.

C — Deep Sky (Photographic)

Any photographs of deep sky objects using standard photographic equipment, techniques and processing (including push processing) can be entered in this category. These photographs may be taken prime focus or piggyback.