books.google.com.br - The Tetrabiblos of the famous astronomer and geographer Claudius Ptolemaeus (ca. 100–178 CE) of Egypt consists of four books, the title given in some manuscripts meaning 'Mathematical Treatise in Four Books', in others 'The Prognostics addressed to Syrus'. The subject is astrology, which in Ptolemy's...http://books.google.com.br/books/about/Tetrabiblos.html?hl=pt-BR&id=t1t-AAAAMAAJ&utm_source=gb-gplus-shareTetrabiblos
