LESSON 1

ARISTOTLE

• He was a greek philosopher
• He thought the earth was the center of the universe

Aristarchus

• Greek astronomer and mathmetician
• Proposed the helencetric model of the universe
• Tried to measure the distance between the moon and the sun

Ptolemy

• Astroomer, geographer, and mathmetician
• lived in Egypt
• He wrote The Algemist
• based on observations of planets from up to 800 years ago
• He believed a celestial being traveled at a constant speed

Copericus

• Polish astronomer
• created the wheels on wheels system
• perfect circles
• seen as first step to modern astronomey

Kepler

• German mathmetician and astronomer
• Found that planets moved in ellipses instead of circles
• Keplers laws

Galileo

• Scientisits
• approached questions with scientific methods
• He improved the telescope
• gave support to the heliocentric model