Dante and the Early Astronomers

according Alfraganus already ancient appear Arab Aries Aristotle astronomy beginning believed bright Brunetto Latini called cause celestial centre century circle compared constellations Conv course Dante Dante's described direction distance Earth east eclipses epicycle equal equator equinox evidently explain fact fall fire given gives Greek heaven heavenly bodies hemisphere horizon idea Italy known later learned less light living look March Mars means mentioned Mercury months moon morning motion mountain move movements nature nearly night observations opposite pass passage period planets pole position probably Ptolemy Purg Purgatory quoted reach reason referred rise round Saturn says seems seen shadow shows side sphere stars suggested sun's takes theory thought true turning Universe Venus whole writings zodiac