The geocentric universe | Modeling the solar system | Measuring the Universe | NASA | Khan Academy. If you're seeing this message, it means we're having trouble loading external resources for Khan Academy. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.
https://www.khanacademy.org/partner-content/nasa/measuringuniverse/spacemath1/a/the-geocentric-universe
The geocentric model of Plato could not explain the retrograde motion of the planets. Around 140 A.D. Ptolemy proposed his refined geocentric model. This model gives predictions on the positions of the planets within a few degrees from the actual positions. This was generally accepted and the Ptolemaic model dominated the western world for 1500 years. It was, in fact, superior to the Copernican system propsed in the 16th century.
http://www.hyperhistory.com/online_n2/people_n2/science_n2/geocentric.html
The Ptolemaic System. The geocentric model of Plato could not explain the retrograde motion of the planets. This model gives predictions on the positions of the planets within a few degrees from the actual positions. This was generally accepted and the Ptolemaic model dominated the western world for 1500 years.
http://www.hyperhistory.com/online_n2/people_n2/science_n2/geocentric.html
The non-geocentric model of the Universe was proposed by the Pythagorean philosopher Philolaus (d. 390 BC), who taught that at the center of the Universe was a central fire, around which the Earth, Sun, Moon and Planets revolved in uniform circular motion.
https://en.wikipedia.org/wiki/Heliocentrism
Around 140 A.D. Ptolemy proposed his refined geocentric model. In the Ptolemaic universe, a planet moves in a small circle called an epicycle, and the center of the epicycle moves along a larger circle around the Earth.
http://www.hyperhistory.com/online_n2/people_n2/science_n2/geocentric.html
The geocentric theory or model was the belief that the Earth was the center of the universe and the Sun and stars revolved around it. Copernicus then introduced the heliocentr…ic model with the Sun at the center. Making the world better, one answer at a time.
http://www.answers.com/Q/Who_proposed_geocentric_theory
Although Copernicus idea that the earth rotates around the sun was correct he still assumed that the planets move in perfect circles, instead of ellipses. Therefore the Copernican system predicted the positions of the planets less precisely than the - incorrect - geocentric model of Ptolemy.
http://www.hyperhistory.com/online_n2/people_n2/science_n2/geocentric.html
Geocentric theory was the first explanation of the solar system  that completely explained and predicted the apparent motions of the  planets. The church also embraced this …theory and defended it  against the heliocentric theory. 4 people found this useful.
http://www.answers.com/Q/Who_proposed_geocentric_theory
It seems that there is a circular nature to the path of all objects in the sky around us. Based on these observations, Plato developed an entire model of the Universe in which everything moved on circular orbits at a constant speed. This was in line with his theory of pure forms, and seemed like a perfect model of the Universe. In this image the stars appear to streak across the sky about a common center. The effect is created as the earth spins along its axis of rotation - Image: Robert KnappEudoxus, one of Plato's pupils, proposed a universe where all objects in the sky sit on moving spheres, with the Earth at the centre.
https://www.khanacademy.org/partner-content/nasa/measuringuniverse/spacemath1/a/the-geocentric-universe
Geocentric theory was the first explanation of the solar system  that completely explained and predicted the apparent motions of the  planets. The church also embraced this …theory and defended it  against the heliocentric theory. Making the world better, one answer at a time.
http://www.answers.com/Q/Who_proposed_geocentric_theory
who proposed the geocentric theory
The geocentric theory was proposed by Ptolemy. Ptolemy proposed the Geocentric theory.