Dec 26, 2009
circa 1300: Dante's understanding of the universe, knowledge of which is key to understanding his work, was based upon the ideas of the Greek astronomer, mathematician and geographer, Claudius Ptolemy (circa B.C. 100-circa 178). Ptolemy asserted that the stars and planets were embedded in crystalline spheres that revolved around the earth. This geocentric (earth-centered) belief placed earth and humanity at the center of all creation, in the location of greatest importance.
Late twentieth century: In 1543 the Polish scholar, Nicolaus...
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