明·万民英 · Chapter 866 / 1491
卷18·太阳
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Chapter 866 of 1491
总龟算法：置积日减一算，以三百六十五日二十五分五十秒为一周天之数除之。冬至行盈度，夏至行缩度，渐盈渐缩，不可槩论。今以盈缩中间率行一度算之。
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