接下来的364年用的都是《授时历》。
为什么《授时历》受外来的影响很小?。
Why Was There So Little Foreign Influence on the Season-Granting System?
许衡领导制订的《授时历》代表了元代的天文学方面的科技水平。
Furthermore, worked out under his instructions represented the scientific and technological level achieved by Yuan dynasty in astronomy.
《授时历》之所以沿用这么长时间，和它的计算精度非常高有很大关系。
The reason why the calendar was used for such a long time has much to do with its accuracy in calculation.
公元1231年郭守敬出生。与他人共同编制“授时历”，创制多种天文仪器。
AD 1231. Birth of Guo Shoujing. Together with others he compiled the 'official calendar' and created many kinds of astronomical instruments.
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。
As an advanced and accurate calendar in the history of China, the Shoushi calendar also occupies a distinct position 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。
As an advanced and accurate calendar in the history of China, the Shoushi calendar also occupies a distinct position in the history of world astronomy.
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