Hipparchus

Hipparchus:
Lived: 190BC-120BC
He was geocentric.
Hipparchus was a Greek astronomer and mathematcian who compiled the first known star catelog.

http://www.hps.cam.ac.uk/starry/hipparchus.html

Copernicus

Copernicus:
Lived: 1473-1543
He was heliocentric.
Copernicus was a Polish astroner and mathematician. He viewed the earth in its daily motion and reported about its motion around its axis and discovered that our sun is stationary.

http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Copernicus.html

Pope Gregory

Pope Gregory:
Lived: 1502-1585.
He was Heliocentric.
Gregory reformed the calendar because he believed in Easter.

http://www.nndb.com/people/953/000091680/

Newton

Newton:
Lived: 1642-1727.
He was Heliocentric.
Newton created the three laws of motion which are now known as Newton's Laws. Newton also came up with the theory about universal gravitaion.

http://scienceworld.wolfram.com/biography/Newton.html

Brahe

Brahe:
Lived: 1546-1601
He was geocentric.
Brahe constructed an astronomical observatory on the island of Ven. He also made amazingly accurate astronomical observations.

http://712educators.about.com/cs/biographies/p/brahe.htm

Galileo

Galileo:
Lived: 1564-1642
He was heliocentric.
Galileo was the father of modern science. His contributions to observational astronomy include the telescopic confirmation of the phases of Venus and the discovery of the four largest satellites of Jupiter.

http://www.thespacesite.com/space_galileo_astronomy.html

Kepler

Kepler:
Lived: 1571-1630
He was heliocentric.
Kepler invented log books that he used for calculating the positions of planets. He also cam up with many theories involving astronomy.

http://inventors.about.com/library/inventors/bl_Johannes_Kepler.htm

Aristotle:
Lived: 384BC-322BC
He was geocentric.
Aristotle made models of the universe which had a profound influense on medival scholars.



<http://www.wsu.edu/~dee/GREECE/ARIST.HTM>

Hipparchus

Hipparchus:
Lived: 190BC-120BC
He was geocentric
Hipparchus was a Greek astronomer and mathematician who compiled the first known
star catalog.

<http://abyss.uoregon.edu/~js/glossary/hipparchus.html>