Claudius Ptolemaeus or Ptolemy
Ptolemy was a Greek astronomer who
lived between 85-165 A.D. He put together his own ideas with those of
Aristotle and Hipparchus and formed the geocentric theory. This
theory states that the Earth was at the center of the universe and
all other heavenly bodies circled it, a model which held for 1400
years until the time of Copernicus.
Ptolemy is also famous for his
work in geography. He was the first person to use longitude and
latitude lines to identify places on the face of the Earth.