A discussion on >Calendar Lishu Jiazi<.

Astronomy and Astrophysics – Astronomy

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History Of Astronomy: Calendars

Scientific paper

Calendar Lishu Jiazi< of the first century BC is the earliest calendar work survival in Chinese history. It was composed of a list which gave sexagesimal date and its fragment of the first day, number of months (12 or 13) and the winter solstice of each year for a 76 year period. The structure and meaning of the text have not been wellknown since it was set up. In this paper, the author analyzed its basic astronomical premises and, then, introduced a mathematical method by which the list was set up. According to the same mathematical logic, the author developed regulations to make the whole calendar: new-moon days, 24 solar terms, leap years and months so that one could get a complete calendar. He discussed its practicability, error and offered a simple way to improve it. He also criticized some principles of the Chinese calendar.

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