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Greek Astronomy Astronomy is the study of the heavenly bodies. It is based on the belief that the position and movement of the stars influence our daily lives. Astronomy, to this day, is considered a science. (Moulton 77) Astronomy began with philosophers and their theories. Pythagoras was the earliest known Greek astronomer. He developed the concept of the earth as the center of the universe. Ptolemy rejected Pythagoras’ theory, and claimed that the sun was the center of our universe. Hipparchus created a theory based on the geometry of circles. He believed that the sun and moon moved around Earth in a circle, and the Earth was not the center of the universe. Ptolemy was the most influential philosopher during 100 A.D. He accepted Hipparchus’s theory, and then preceded to expand on it. He believed that the orbits were interlocking circular orbits. Brahe had a theory that the sun revolved around the earth, and