Rech_History of Astronomy timeline

384-322. Aristotle was a Greek philosopher. Aristotle contributed a geocentric (Which represents Earth as the center.) model in 4C BC. This model had Moon, Mercury, Venus, Sun, Mars, Jupiter, and Saturn revolving around Earth. He also pointed out that Earth was spherical, because the shadow of Earth was always round. He considered the idea of Earth orbiting the sun but ultimately rejected it because his theory was that if earth orbited the sun the stars would change positions.

100-168. Ptolemy was an astronomer, mathematician, and geographer. He had a collection of descriptions that described his work and ideas, called the Almagest. The most prevalent idea about astronomy in The Almagest was the Ptolemaic Solar System Model. His model had Earth as a stationary sphere, surrounded by stars. His model was geocentric, and incorrect. However, Ptolemy did discover that starlight was refracted in Earth's atmosphere. He also studied optics.

1473-1543. Copernicus proposed a heliocentric universe. This was called The Copernican Model. The Copernican Model altered later astronomer's view of the universe, even if the idea was rejected by most.

1546-1601. Tycho Brahe was loyal to the idea of a geocentric universe. He set out to provide proof of one, so he studied planetary motion. He had the best measurements of the sky (for the time.) His observations were very precise. All the information he collected was later used by Kepler.

1564-1642. Galileo Galilei made several contributions to astronomy, the most notable being the Galilean moons. The Galilean moons were the four massive moons of Jupiter discovered by