The impact of Hipparchus’s work was profound and long-lasting. His star catalog and findings on precession were used by the famous astronomer Ptolemy in his seminal work, the Almagest. Hipparchus’s methods and data helped shape the Ptolemaic system, which dominated astronomical thought for over a millennium. Hipparchus’s advancements in trigonometry were crucial for later astronomical calculations. His work provided the mathematical tools necessary for the heliocentric models proposed by Copernicus and refined by Kepler and Galileo.
