Can you briefly describe the current lunar calendar (Zijin calendar)

At present, the lunar calendar used in China is released by Nanjing Purple Mountain Observatory. This calendar seems to have no exact name, commonly known as Zijin calendar. As far as the principle of calendar compilation is concerned, it has continued the almanac thoughts such as Chongzhen Almanac compiled from the late Ming Dynasty and Shixian Almanac compiled in the Qing Dynasty, but astronomical models and forecasting methods have become modern astronomical means. It is one of the few astronomical calendars in the world today and has a one-to-one correspondence with some important astronomical phenomena. ?

The main rule framework of the arrangement of the calendar spectrum of Zijin Calendar;

The average transit time in the east longitude 120 degrees sun is the beginning of a calendar day when children are young.

The lowest solar altitude angle in the northern hemisphere (depending on the longitude of the sun of 270 degrees) is the winter solstice of the lunar calendar, which is divided into 12 neutral day and 12 seasonal day. Calendar days including solar terms are festivals. Two adjacent fixed winter solstices are one year.

The moment when the longitude difference between the sun and the moon is 0 degrees (when the sun and the moon meet) is the new moon moment, in which the new moon moment is the new moon day and two adjacent new moon moments are a new moon strategy (new moon period).

Set the new moon as the first day of the calendar, and the calendar will be completed.

Set the winter calendar month as the sub-month (Jiazi), that is, 1 1 month (Xu) of the lunar calendar, and the calendar month will be completed.

If there are 12 fixed dates between two winter solstice days, it is a leap year (13 calendar month). The first calendar month without neutral day in the previous winter solstice is the leap month of the previous month, and the year ends.

The calendar takes the calendar month of Yin Jian as the first month, and the first day of the first month is New Year's Day, and the day before is New Year's Eve.

Fixed space, fixed moon and time system are calculated according to the latest astronomical theory and data.

Please refer to:/question/25070209/answer/30009903.