The heliocentric theory states that the sun is at the center of the solar system. The word heliocentric means sun and center developed by the Greeks. It was in the 16 century that astronomer Copernicus a mathematician presented a mathematical of the heliocentric system and how it worked. Galileo as way as Kepler believe in the heliocentric and supported it with his evidence.

However, the geocentric theory stated that the earth in in the center of the universe and the rest of the planets surround it . Both Aristotle and Ptolemy supported the geocentric theory, but not only them also some philosophers they call it the naked eye planet. To support this theory they had some observations. First believe and assumed that the sun and the stars revolved around the earth as it was seemed. Second that the earth was solid which means that for now is resting and not moving around.

Galileo was born in 1564 around teh same time that ShakesSpears. Then when he started to go to the University of Padua he started to get a intrested or a believe in the Copernican theory. The Copernican theory said that the sun was in the center of teh universe and that earth roated around the sun or a axis in one year it went around. Galileo started to teach the theory , however the Catholic church was not to happy about this. For this reason they arrested Galileo and this was the end of his life. He was also put on the Index of Prohibited Books, together with the books by Copernicus and Kepler treating of the heliocentric system. HE died in Michelangelo and he was executed.