He is most famous for his book the "Kitāb az-Zīj" (or the "Zij"). The "Zij" was a book with 57 chapters dedicated to astronomy. He influenced the works of Copernicus, Johannes Kepler and Tycho Brahe, who were famous astronomers of later times. The book was translated many times into many different languages. Inside the "Zij", Al-Battani made a map of the stars, naming a few of them.