问题的提出：日历的编排是每400年一个大循环周期，即今年的月、日、星期几和400年前的完全一样。现行天文历法根据天体运行规律，取每年365.2425天。这样，每400年共有365.2425×400＝146097天。如果以365天作为一年，每400年就少了0.2425×400＝97天。这97天要靠设置闰年（每年366）天来凑齐，所以，每400年要设置97个闰

-Of the problem: the structure of the calendar every 400 years is a big cycle, that is, this year' s month, day, week and 400 a few years ago, exactly the same. Existing astronomical calendar to run in accordance with the laws of celestial bodies, 365.2425 days a year access. In this way, every 400 years a total of 365.2425 × 400 = 146097 days. As if 365 days a year, every 400 years less 0.2425 × 400 = 97 days. This is a leap year 97 days depends on the set (366 a year) days to put together, so every 400 years a leap to set up 97