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I, Nicolaus Copernicus am a polish astronomer and I have made a book called “On the Revolution of the Celestial Spheres.” I am familiar with Ptolemy’s theories and writings, but I Copernicus have come to the conclusion that Ptolemy was making less and less sense to him through out the years. Ptolemy believed that the earth was in the center and that the planets and the sun orbited around the earth. People believed his theory for 1,400 years, but as I studied the sky, Ptolemy’s theory seemed less sense so I asked myself a question what if the sun was in the middle and the planets orbited around it. This was my theory but I was afraid to tell the world about my theory, because I was afraid of persecution or even death at the hands of church officials.