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>384-322 BCE

>Greek Philosopher

>Acknowledged that the Earth was in the middle of all surrounding things (observed)

>One of the first thinkers to show an aspect on the solar system

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>310-230 BCE

>Greek Astronomer and Mathematician

>Valued that the Sun was in the middle of all surrounding things instead of Earth. He also measured the distances in small ratios.

>A second early thinker to show a different aspect on the solar system

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>100-170 CE

>Astronomer, Geographer, and Mathematician

>He had similar thoughts like Aristotle and created a geocentric model (used for 14 years). He believed that celestial bodies traveled at speeds in a perfect cirlce.

>Ptolemaic Model

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>1473-1543

>Polish Astronomer

>He thought that Ptolemy's model was too complex. He then modeled the heliocentric system based off of Aristarchus'  theory and Ptolemy's system

>He was an important thinker because he was able to make a model based off of 2 peoples different thinking

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>1571-1630

>German Mathematician and Astronomer

>He was one of the thinkers to develop three laws. The first law stated that planetary orbits are ellipses with the sun. The second law stated that celestial bodies constantly orbited when they were around the sun. The third law stated relations between the planets from the sun to the time of the orbit.

>Didn't really believe in heliocentric or geocentric

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>16th-17th Century

>Italian Mathematician, Physicist, and Astronomer

>Demonstrated that all bodies fall at the same rate (they ratain velocity unless an unbalanced force has occurred on them)

>Made improvements in telescope technology

>He was important because of his advancement based on the other 5 early thinkers