He was a great follower of the famous Pythagoras of Croton. He was responsible for placing all the planets in the correct order with respect to the sun. However his astronomical ideas were mostly rejected in the beginning because most Greek astronomers accepted the geocentric model more. Aristotle and Ptolemy were more successfully followed until Copernicus came up with exactly the same theory as Aristarchus. When Archimedes drew the diameter for the earth, it was based on the theory developed by Aristarchus and event his was known much later. Much of the original text explaining the theory has been lost.

Based on Aristarchus theory, the stars were located extremely far away and there was no visible parallax which means that the stars moved in relation to the sun and the earth and the other nine main planets. However, Aristarchus theory of the center of the earth was never accepted and was rejected even much later. Other theories mainly were more popular and the Greeks always believed that the center of the universe was earth and that is why many astronomers came up with a geocentric model. So basically even earth was placed in relation to the sun in the geocentric model and they all revolved around the sun.

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