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Greeks
• Discovered the planets
• Planet is the greek word meaning wanderers
• Called wanerers because they sometimes moved in the opposite direction from the rest of the visible stars in the sky
• Geocentric - Earth is at the center of the solar system
• all planets, stars and our sun revolves around the Earth
Heliocentric
• Sun at the center of the solar system
• Copernicus 1473-1543
• Worked out the arangement of the known planets and how they moved around the sun
• (just a way to know where a planet is located at any given time)
• Animation
Galileo 1564-1642• Used telescope to see
moons revolving around Jupiter
• Why was this important?• Also noticed that full
phase of Venus is much smaller than cresent phase of Venus
• Why was this important?• Contradicts previous view
that everything in the solar system revolves around the Earth.
• Venus is further from the Earth at full phase. Therefore, it is smaller in size.
• When Venus is in cresent phase it is close to Earth. Larger.
Tycho Brahe 1546-1601
• Over 20 years of detailed observations recording the location of the planets