《明史·志·卷七》
只有明的《大统历》，实际上就是元的《授时历》，袭用了二百七十多年，未曾改变历法。
惟明之《大统历》，实即元之《授时》，承用二百七十馀年，未尝改宪。
Only the "Datong Calendar" of the Ming Dynasty was actually the "Shoushi Calendar" of the Yuan Dynasty, which was used for more than 270 years without changing the calendar.
<s>[INST] 翻译: 惟明之《大统历》，实即元之《授时》，承用二百七十馀年，未尝改宪。 [/INST] Only the "Datong Calendar" of the Ming Dynasty was actually the "Shoushi Calendar" of the Yuan Dynasty, which was used for more than 270 years without changing the calendar.</s>
翻译: 惟明之《大统历》，实即元之《授时》，承用二百七十馀年，未尝改宪。
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Only the "Datong Calendar" of the Ming Dynasty was actually the "Shoushi Calendar" of the Yuan Dynasty, which was used for more than 270 years without changing the calendar.
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