Mathematical problems of ancient calendars, the top level of mathematics has entered! (Practical application)

In ancient China, the Gregorian calendar year was 60 years, and the calendar year was determined by years. The period was the least common multiple of 65438+ February, five years and 60 years, that is, a month in a year was 60 years. For example, the year of Jiazi, the next year is 60 years, which is often said to be 60 flowers.

It should be noted that the lunar calendar in China is a combination of yin and yang, which is mainly determined by the revolution of the earth around the sun. Therefore, the chronology of cadres and branches is not affected by leap month, big month and small month. The twenty-four solar terms correspond to the twenty-four equal points of the earth's revolution around the sun, specifically to the second. For the natural moon produced by the rotation of the moon around the earth, if there are knots and lifeless months, it is called leap month. )

Similarly, the daily branch and branch are 6 1 cycle, and the discipline of the branch and branch is also determined by the day, so the period from the first day of Jiazi to the next day of Jiazi is also 60 days.

Therefore, it takes 60 years for B, B, C and D in the lunar calendar to be reincarnated. If the earth revolves for 365.4438+099 days, it takes 2 195438+0438+094 days for a reincarnation.

As for the Gregorian calendar, or the new calendar, AD, because the year is determined by the ordinal number, the year when Jesus was born is AD 1, which is never repeated.