How did ancient Greece influence astronomy? The ancient Greeks were some of the first people to study the sky and understand astronomy. They realized the Earth was a sphere, or a three-dimensional circular object, and tried to measure its size. They also created an idea of a geocentric solar system in which everything orbits around the Earth.
What did the Greeks do in astronomy? The greatest Greek astronomer is Hipparchus of Nicea (l. c. 190-c. 120 BCE). He created accurate models for the motion of the planets, the first star chart, and developed mathematical principles for calculating astronomical events.
When did Greek astronomy start? Greek thinking about the motion of the planets began by about 400 bce. Eudoxus of Cnidus constructed the first Greek theory of planetary motion of which any details are known.
How did the Greeks see planets? Five planets — Mercury, Venus, Mars, Jupiter, and Saturn were known to the ancients. To the unaided eye, these planets appear starlike. However, the planets moved relative to the stars. For this reason they were called wandering stars.