Astronomical events refer to any natural phenomenon that occurs in the universe, outside of Earth's atmosphere. This can include events such as solar and lunar eclipses, meteor showers, planetary alignments, comets passing by, and the appearance of supernovae. Studying these events can help scientists understand the formation and evolution of celestial bodies, as well as the physical laws that govern the universe. Observing and tracking astronomical events is a popular activity among amateur astronomers and can provide valuable data to researchers in the field.