... and how it existed, let us first study the evolution of the different studies of the universe. Ptolemy and the Solar System Long time ago, scientists believed that the sun revolved around the earth, they all agreed with the scientist Ptolemy's explanation that the earth was like a stationary globe where other seven planets revolved around it. Ptolemy's seven planets were: the moon, the sun, Mercury, Venus, Mars, Jupiter, and Saturn. The Almagest explains Ptolemy's work. Ptolemy's model explained the circling motion of the planets with the stars as its background by suggesting that all the planets move in small circles as they went around the earth in their orbital path. The path that they make around the earth is called deferent while their movement about themselves is called epicycle. He also moved the planets off the center. Although this was wrong, it was helpful in predicting the position of the ...

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