<P> Early in the 11th century Alhazen wrote a scathing critique of Ptolemy 's model in his Doubts on Ptolemy ( c. 1028 ) , which some have interpreted to imply he was criticizing Ptolemy 's geocentrism , but most agree that he was actually criticizing the details of Ptolemy 's model rather than his geocentrism . Abu Rayhan Biruni ( b . 973 ) discussed the possibility of whether the Earth rotated about its own axis and around the Sun , but in his Masudic Canon , he set forth the principles that the Earth is at the center of the universe and that it has no motion of its own . He was aware that if the Earth rotated on its axis , this would be consistent with his astronomical parameters , but he considered it a problem of natural philosophy rather than mathematics . </P>
<P> Early in the 11th century Alhazen wrote a scathing critique of Ptolemy 's model in his Doubts on Ptolemy ( c. 1028 ) , which some have interpreted to imply he was criticizing Ptolemy 's geocentrism , but most agree that he was actually criticizing the details of Ptolemy 's model rather than his geocentrism . Abu Rayhan Biruni ( b . 973 ) discussed the possibility of whether the Earth rotated about its own axis and around the Sun , but in his Masudic Canon , he set forth the principles that the Earth is at the center of the universe and that it has no motion of its own . He was aware that if the Earth rotated on its axis , this would be consistent with his astronomical parameters , but he considered it a problem of natural philosophy rather than mathematics . </P>
who said the sun revolved around the earth
who said the sun revolved around the earth
Ptolemy
Ptolemy