The Alfonsine Tables are a set of astronomical tables created in the 13th century under the direction of King Alfonso X of Castile. They were designed to help astronomers calculate the positions of celestial bodies, such as the Sun, Moon, and planets, over time. These tables were based on earlier works, including those from Ptolemy and Islamic astronomy, and represented a significant advancement in the field. These tables provided precise data for various astronomical phenomena, making them essential for navigation and calendar-making. The Alfonsine Tables influenced later works in astronomy, including the Copernican revolution, and were widely used in Europe until the adoption of more modern methods.