ASTRONOMERS TIMELINE

ARISTOTLE

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• Greek philosopher
• Thought the earth was the center of the solar system
• Made a model that placed the earth as the center

ARISTARCHUS

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• Greek astronomer
• Mathematician
• Proposed a heliocentric solar system
• Attempted to measure distances of the earth and sun

PTOLEMY

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• Astronomer
• Geographer
• Mathematician
• Made a book called Almagest
• His book was based on observations of the planets

NICOLAUS COPERNICUS

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• He considered the idea of a heliocentric system
• Felt that Ptolemy's system was too complicated
• He used a "wheels on wheels" system

JOHANNES KEPLER

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• German mathematician and astronomer
• Noticed that the planets' paths aren't and exact circle
• Formulated 3 principles known as Keplers Laws

GALILEO GALILEI

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• Approached questions in different way
• The different way is known as the scientific method
• Made the telescope
• Observed moons orbiting Jupiter

ISAAC NEWTON

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• Made a reflecting teliscope
• One of the most influential scientists of all time

EDWIN HUBBLE

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• Created hubbies law
• The law is about the universe constantly expanding
• Found galaxies past the Milky Way