Shoushi Calendar

There he formulated the Shoushi calendar and calculated the year to be 365 . 2425 days .

在忽必烈的天文台工作，他编制了《授时历》，计算出每年有365.2425天。

Soon after its compilation ， the Shoushi Calendar was Spread to and adopted by Japan and Korea .

《授时历》编制不久即传播到日本、朝鲜，并被采用。

As an advanced and accurate calendar in the history of China ， the Shoushi Calendar also occupies a distinct posi-tion in the history of world astronomy .

作为中国历史上一部先进的、精确的历法，《授时历》在世界天文学史上也占有突出的位置。

Secondly , based on earlier scholars finding that the length of the tropical year was gradually shortening ， the Shoushi Calendar held that the tropical year shortened by 0 .

其次，它吸收了前人研究发现的回归年的长度在逐渐变小的观点，规定100年中回归年的长度减小0.0001日。

In recent years ， astronomers from Japan ， European and North American countries are again showing interests in ahe Shoushi Calendar ， and some broad and in-depth researches have been made .

近年来日本和欧美等国的天文学家对《授时历》产生了新的兴趣，进行了广泛而深入的研究。

This paper tries to elaborate on Qian 's achievements in his study of the Shoushi Calendar from its historical inevitability of emergence , its brilliant merits and its profound basis in China 's national culture .

该文试从《授时历》诞生的历史必然、辉煌成就及民族文化渊源等方面，论述钱先生对《授时历》研究的贡献。

Shoushi Calendar ， the most outstanding calendar in ancient China ， was compiled by Guo Shoujing ， a prominent scientist in the Yuan Dynasty ， and his colleagues . Enforced in 1281 , throughout the Ming Dynasty and the begin-nin4 of the Qinq Dynasty ， the calendar was used for over 360 years .

《授时历》是中国古代最优秀的历法。由元代著名科学家郭守敬等人编制，从1281年开始实行，历经整个明代，一直到清初，共用了360多年。