The answer to this question is providing biographical information by specific astronomers and his discoveries.
by providing biographical information about specific astronomers and their discoveries
Ball has written a book about the great astronomers and reveals that astronomy would not be what we know today without the lives of these men who have contributed so much to the development of this science. During the development of his book, Ball can refine the central idea by providing biographical information about specific astronomers and their findings, thus proving how important these men were and how they influenced astonomy.
Ball develops and refines this central idea in his book by telling dramatic, engaging stories about the lives and works of ancient astronomers
In the introduction of "Great Astronomers" by Robert Stawell Ball, he talks about the achievements of people in history that were related to astronomy and the sciences that helped to develop it, a very particular case in this introduction is the story of Claudius Ptolemy and how his life and achievements were fundamental for astronomers.