ocr: GEOCENTRIC WORLD VIEW When the Greek astronomer Hipparchus (c. 190 - 120BC) compared his own measurements to those 150 years older, he noticed that the position of the stars had changed about two degrees. The explanation was that the Earth's axis slowly draws a circle just like a fast spinning top. Hipparchus also noticed that the Sun's motion in the sky is not even throughout the year, i.e. the Sun moves faster in the winter and slower in the summer, As an explanation he suggested the epicycle, which had been developed earlier to explain irregularities in circular motions. (The first one to p ...
