ASTRONOMERS

ARISTOTLE

• 384-322 BCE
• Was Greek
• Writings include physics, biology, zoology
• Taught Alexander the Great
• Studied metaphysics

ARISTARCHUS

• Presented first model of the galaxy
• Greek
• 310-230 BCE
• Was a great mathematician

PTOLEMY

• 100-170 BCE
• Book of observations of planets
• Developed a detailed geocentric model
• Beloved that a celestial body traveled at a constant speed

NICOLAUS COPERNICUS

• 1473-1543
• Developed first detailed heliocentric model
• Like Ptolemy had a wheels on wheels system

JOHANNES KEPLER

• A German mathematician and astronomer
• Founded Kelpers laws
• Planets move faster closer to the sun
• 1571-1630

GALILEO GALILEI

• 1564-1642
• Made improvements to the telescope
• Observed moons
• His obese rations showed that earth was not the only object orbited