Ancient Greek Astronomy Ancient Greek Astronomy Astronomy is the study of the stars, planets, and other objects that make up the universe.
Astronomers observe the locations and motions of heavenly bodies.
Beginning around 600 BC, Greek philosophers and scientists developed a number of important astronomical ideas. The early Greek astronomers knew many of the geometrical relationships of the heavenly bodies. Pythagoras, who lived during the 500s BC , argued that the earth was round. He also tried to explain the nature and structure for the universe as a whole. He developed an early system of cosmology.