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Around 318 - 322 B.C.E.

Thought that the motions of planets and stars were perfect circular movements
Thought that the orbits would go on forever
Thought that the planets and stars were perfect spheres though Earth itself was not

-Geocentric

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Around 310 - 230 B.C.E.

Developed the Heliocentric Model:
-Earth rotates on an axis
-Moon < Sun
-Sun remains within the midst of the solar system
-Earth orbits the sun
-The concept was disbelieved + declined existence

-Heliocentric

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Around 100 - 168 C.E.

Astronomer and mathematician
Believed Earth was the center of the Universe.
He was able to combine what he saw of the stars' movements with mathematics, with geometry, to predict the movements of the planets, and worked out that the planets must move in epicycles, smaller circles, and the Earth itself

-Geocentric

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1473 - 1543 C.E.

Nicolaus Copernicus came up with a radical way of looking at the Universe. His heliocentric system put the Sun (helio) at the center of our system. His ideas, including the revelation that the Earth rotates on its axis, were too different for most of the scholars of his time to accept. They used only parts of his theory.

-Heliocentric

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14 December 1546 - 24 October 1601

Formed compromised model, since in Copernicus’ and Ptolemy’s theory; all stars remain within an unchanging sphere that revolves Earth, and Tycho announced phases of Venus

-Geocentric

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15 February 1564 - 8 January 1642

Devised a telescope that could enlarge objects up to 20 times, Proved the truth of the Copernican system of heliocentrism. Supported Kepler's theory of ellipses. Was a brilliant student with a genius for invention and observation.

-Heliocentric

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27 December 1571 - 15 November 1630

Realized that the planets' orbit around the sun doesn't have to be a circle, it could be an ellipse

-Heliocentric

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4 January 1643 - 31 March 1727

He continued to expand the work of Galileo- the relationship between energy and motion. He invented the 3 laws of Motion, produced convincing proof to support the heliocentric theory, saying that the sun exerted a constant pull which caused the the earth to rotate around the sun

-Heliocentric