몽골제국의 위구르력과 󰡔중수대명력(重修大明曆)󰡕

Abstract

The Chinese-Uighur calendar, the so-called ''Qitai calendar'', was used for a century in Mongol Ilkhanid (1256-1335). Nasir al-Din al-Tusi (1202-1274), a Persian astronomer of the 13th century, first introduced the Qitai calendar in his Īlkhānī-zij, which he compiled with Chinese astronomers at the Maragha Observatory under the order of Hulagu Khan (1215-1265). After his zij, the calender was described in a number of Islamic zijes in Iran and Central Asia. This calendar was used among the Mongols, Uighurs, and Turks of the ruling class in the Mongol Ulus. The Qitai calendar is a luni-solar calendar that combines the astronomical parameters and calculation methods of Chinese and Uighur calendars. It is known that the calendar is based on the Revised Daming-li (重修大明曆) of Jin (金) dynasty adopted in 1215 and the Futian-li (符天曆) of the Tang (唐) period. This paper, therefore, examines the contents and origins of the Qitai calendar through exploring its relationship with the Revised Daming-li and the Futian-li. Particularly, by comparing astronomical constants and calculation methods used in the both calendars, we trace the exchanges and reciprocal influence of astronomical knowledge between the East and the West during the Mongol period. As a result, we unravel how calendrical knowledge based on the Revised Daming-li had an exerted important influence on the compilation of the Qitai calendar in Mongol Ilkhan and the Shoushi-li (授時曆) in Mongol Yuan (元). Moreover, we can see how long the Qitai calendar and the Shoushi-li influenced neighboring countries in the East and the West of Central Asia, respectively.