不同于西方历法,中国的历法是参照月亮的盈亏周期制定的。于是,阴历的一年与西历一年的365日又5时48分46秒差出10日又21时。依此推算,只需17年,在阴历的同样月份里就会发生季节的倒置。因之,积以置闰,每3年要闰一个月,每5年闰两个月,19年闰七个月,有闰月的那年 Unlike the Western calendar, China’s calendar is based on the moon’s profit and loss cycle. Thus, the year of the lunar calendar and the calendar year 365 days and 5:48:46 the difference between the 10th and 21 o’clock. According to this calculation, it takes only 17 years and the season will be inverted in the same month of the lunar calendar. Therefore, plot to set intercalation, leap every 3 years a month, every 5 years leap two months, 19 years leap seven months, there is a leap month