We know very little of Ptolemy's life.In fact there is no evidence that Ptolemy was ever anywhere other than Alexandria.Ptolemy's major works have survived and we shall discuss them in this article.Ptolemy devised new geometrical proofs and theorems.An interesting discussion of Ptolemy's theory of the moon is given in .The most important, however, is the Almagest which is a treatise in thirteen books.3 = 1.73205.This is the story of a scientific crime.Well do I know that I am mortal, a creature of one day.Zeus himself I take my fill of ambrosia, the divine dish.