Almagest's the Latin form of the Arabic name ( in English The Great Book) of a mathematical and astronomical treatise proposing the complex motions of the stars and planetary paths, originally written in Greek as (Mathematical Treatise; later titled, The Great Treatise) by Ptolemy of Alexandria, Egypt, written in the 2nd century. Its geocentric model was accepted as correct for more than a thousand years in Islamic and European societies through the Middle Ages and early Rennaissance. The Almage… (More on Almagest)