The chart, Theoria Eclipsium, was another significant collaboration between Johann Baptist Homann and Johann Gabriel Doppelmayr, created in the early 18th century. Like "Systema Solare et Planetarium," this chart was a product of interest in astronomy and celestial events. Theoria Eclipsium focused specifically on eclipses, both solar and lunar. Eclipses were of great interest to astronomers due to their dramatic and sometimes ominous appearances. Understanding and predicting eclipses were essential for several reasons, including navigation, agriculture, and cultural significance. The chart depicted the paths of solar and lunar eclipses across the Earth's surface, illustrating how these celestial events occurred in different regions and at various times. It would have provided valuable information for astronomers, navigators, and others interested in celestial phenomena.