IDEAS ABOUT THE

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IDEAS ABOUT THE SOLAR SYSTEM
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Aristotle

• Greek philosopher
• (350 BCE)
• Five elements
• 1. Earth
• 2. Water
• 3. Air
• 4. Fire
• 5. Ether

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Aristotle (cont.)

• Elements place
• Perfect circles

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Ptolemy

• Egypt (150 CE)
• Geocentric world
• 1. Definition
• 2. Perfect circles
• Retrograde motion
• 1. Definition
• 2. Epicycles
• 3. Fudged the math

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Middle Ages (500-1500)

• Life
• Science

Copernicus

• Polish astronomer
• (early 1500s)

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Copernicus (cont.)

• Heliocentric world
• 1. Definition
• 2. Earth rotates
• 3. Stars
• 4. Perfect circles
• Public reaction
• Scientific revolution

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Tycho

• Danish astronomer
• (1577)
• Detailed observations
• and charts
• 1. Supernova
• 2. Comet

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Tycho (cont.)

• Refined geocentric theory
• 1. Earth
• 2. Moon and sun
• 3. Five planets
• 4. Stars/solid spheres
• 5. Perfect circles

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Kepler

• German (1609)
• Tychos assistant
• Elliptical orbits
• 1. Definition
• 2. Focus (foci)
• 3. Sun
• Planets/matter

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Galileo

• Italian (1610)
• Telescope
• 1. Moon
• 2. Venus
• 3. Jupiters moons
• 4. Saturns rings
• 5. Sunspots
• Observations