Twenty-four histories 17 volumes, covering astronomy, calendar, five elements and astronomical phenomena. There are traditional astronomical records in all kinds of astronomical records, which ensure the integrity of ancient astronomical records in China. These records are the main sources of data for studying the history of Chinese astronomy. Twenty-four histories are devoted to astronomy, calendar, five elements and astronomical phenomena, including historical records, Han books, later Han books, Jin Shu, Song books, Nanqi books, Shu Wei, Sui Shu, old Tang books, new Tang books and new Tang books. Some of these historical records are of great value for the first time in history books.