The science of astronomy focuses on understanding celestial events and objects, such as planets, stars, galaxies, and the evolution of the universe. Astronomers and astrophysicists apply foundational ideas in physics to collect data, interpret observations, and construct models of astrophysical systems.

The curriculum at Denison emphasizes the observational and quantitative nature of modern astronomy. The department has excellent equipment and facilities for teaching astronomy, including the Swasey Observatory and the Marilyn P. McConnell Planetarium.