In his book Great Astronomers, Robert Stawell Ball traces the development of astronomy from the ancient period of Ptolemy's time to the nineteenth century. Ball's approach is historical. He gives readers insight into the life and works of well-known astronomers. In this activity, you will analyze the selection from Ball's chapter on Ptolemy. Support your answers with evidence from the text. Part A What is the central idea of the Prolery selection? How does Ball develop this central idea?
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