"Almagest" is a seminal work on astronomy and mathematics, written in the 2nd century. The book presents a comprehensive system of the world, including a detailed account of the fixed stars and the motions of the planets. It also includes a mathematical toolkit that was essential for understanding the heavens in its time, such as a catalogue of stars, the lengths of the tropical year and the lunar month, and the theory of the Sun, Moon, and planets. The book's geocentric model, where the Earth is at the center of the universe, was widely accepted until the Copernican Revolution.

The 7243rd greatest book of all time