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Geocentric Model
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Epicycles & Deferents
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Galileo’s discoveries
• Moon has mountains
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Galileo’s discoveries
• Sun has spots
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Galileo’s discoveries
• Saturn has rings
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Galileo’s discoveries• Milky Way is a collection of stars
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Galileo’s discoveries
• Jupiter has 4 large moons
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Galileo’s discoveries
• Venus experiences phases like Moon
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Phases of Venus
• Geocentric Model– Venus is always
found close to the Sun in the sky
– Sun & Venus must move along deferents at the same rate
– Can never observe “full” Venus
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Phases of Venus
• Heliocentric Model– Venus is always found close to the Sun in the
sky– Venus must be an inferior planet