(ARISTOTLE) (384-322 BCE)

ARISTOTLE CON..

• He thought earth was the center of everything
• He made a diagram of orbiting planets
• That the parallax couldn't be seen with the naked eye

ARISTARCHUS (310-230 BCE)

ARISTARCHUS CON..

• He made a heliocentric model of the solar system
• He tried to measure the distance to the sun from earth
• He and his "inventions" are a major contribution to science

PTOLEMY (100-170 CE)

PTOLEMY CON..

• His book "Almagest" is the few books from his time
• It was based on observations of the planets
• He invented something that told the planets motion in the future

COPERNICUS (1473-1543)

COPERNICUS CON..

• Data was observed with the naked eye in his time
• He adopted Ptolemy's ideas
• His observation fit observations better than the geocentric model of Ptolemy

KEPLER (1571-1630)

KEPLER CON..

• He did an observation where nothing was a perfect circle
• He tried again and found out that ellipses fit best
• He formed 3 principles which are called "Kepler's laws"

GALILEO (1564-1642)

GALILEO CON..

• He made improvements to the newly invented telescope
• He viewed celestial objects with his improved telescope
• He observed the moons; Io, Europa, Callisto and Ganymede which orbit Jupiter
• Those moons are in a group called the Galilean satellites

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