Alfonso X's Astronomical Tables

Alfonso X's Astronomical Tables, also known as the "Alfonsine Tables," are a medieval star catalog created in the 13th century. They compile detailed data about the positions and movements of planets, the Sun, and the Moon, based on earlier Greek and Islamic sources. Developed under King Alfonso X of Castile, these tables aimed to improve the accuracy of celestial predictions for navigation, astrology, and timekeeping. They represent a significant advancement in medieval astronomy, combining scientific observations with scholarly work, and had a lasting influence on later astronomical research in Europe.