History of Song 宋史
卷八十四 志第三十七 律曆十七 Volume 84 Treatises 37: Measures and Calendar 17
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演紀上元甲子歲距，紹熙五年甲寅歲積三千八百三十。至慶元已未歲積三千八百三十五開禧上元甲子至開禧三年丁卯，歲積七百八十四萬八千一百八十三，成天上元甲子距鹹淳七年辛未，歲積七千一百七十五萬八千一百四十七。Chinese text: This work was published before January 1, 1923, and is in the
public domain worldwide because the author died at least 100 years ago.
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