Ancient Greek Astronomy

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Greek philosopher

Believed the Earth was the center of the universe

Earth was surrounded by water, air, and fire

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He thought that the moon, sun, five planets, and the stars all revolved around the Earth

Geocentric model

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Sun is the center of the universe

Heliocentric model

First to measure the distance to the sun and moon

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REVOLUTION is the cycle in which a planet orbits the sun (one year)

ROTATION is the cycle of a planet spinning on its axis; day to night (one day)

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Imaginary line on which an object rotates

Earth’s axis goes through its center from the North to the South Pole

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What is the major difference between the universe models of Aristotle and Aristarchus?

How is rotation different from revolution?

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Agreed with ARISTOTLE’S geocentric model

Retrograde motion is the idea that a planet moves back and forth in a looping motion; “Mars”

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Heliocentric model

Expanded the ideas of Aristarchus

Identified the positions of the planets

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Spent most of his life trying to prove the theories of Copernicus

First to effectively use the telescope

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Roman Catholic Philosophy

Earth and humans are the center of all things

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Why would the Roman Catholics care whether the Earth was the center of the universe?

What is retrograde motion?

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What is the difference between heliocentric and geocentric?

What was Ptolemy’s theory?

Why was Galileo important?