Ancient Greek Astronomy: From Aristotle to Ptolemy

Ancient Greeks were among the first to explain the cosmos logically.
Aristotle argued that Earth was a sphere at the universe’s center.
Hipparchus created the first known star catalog around 150 BCE.
He also discovered the precession of Earth’s axis.
Eratosthenes measured Earth’s circumference with striking accuracy.
Aristarchus proposed a Sun-centered universe centuries before Copernicus.
Greek astronomers refined the concept of celestial spheres.
Ptolemy’s Almagest became the foundation of astronomy for 1,400 years.
They used geometry to predict planetary positions and eclipses.
Greek sky-watching blended science, philosophy, and mythology.