The Almagest is a 2nd-century mathematical and astronomical treatise on the apparent motions of the stars and planetary paths. Written in Greek by Claudius Ptolemy, a Roman era scholar of Egypt, it is one of the most influential scientific texts of all time, with its geocentric model accepted for more than twelve hundred years from its origin in Hellenistic Alexandria, in the medieval Byzantine and Islamic worlds, and in Western Europe through the Middle Ages and early Renaissance until Copernicus.

1. The Almagest was the standard reference for astronomers in the Western and Islamic worlds for over a thousand years.
   《大天文集》在西方和伊斯蘭世界中，曾作為天文學家的標準參考書超過千年。
2. Many of the theories in the Almagest were later challenged by the Copernican Revolution.
   《大天文集》中的許多理論后來在哥白尼革命中受到挑戰(zhàn)。