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Ji Gu Suan Jing 缉古算经

Ji Gu Suan Jing 缉古算经

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Author

Wang Xiaotong 唐-王孝通


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  假今天正十一月朔夜半,日在斗十度七百分度之四百八十。以章岁为母,朔月行定分九千,朔日定小余一万,日法二万,章岁七百,亦名行分法。今不取加时日度。问:天正朔夜半之时月在何处?(推朔夜半月度,旧术要须加时日度。自古先儒虽复修撰改制,意见甚众,并未得算妙,有理不尽,考校尤难。臣每日夜思量,常以此理屈滞,恐后代无人知者。今奉敕造历,因即改制,为此新术。旧推日度之术,巳得朔夜半日度,仍须更求加时日度,然知月处。臣今作新术,但得朔夜半日度,不须加时日度,即知月处。此新术比于旧术,一年之中十二倍省功,使学者易知)
  答曰:在斗四度七百分度之五百三十。