Since ancient times, there have been lunar calendars and lunar calendars. What's their difference?

The so-called calendar is a science that studies the movement of the sun, the moon and the five stars, calculates the length of various time units, establishes the relationship between them and formulates the law of time series. In the ancient history of China, it is said that there are many kinds of calendars, and several kinds were introduced in each dynasty. At the end of the Ming dynasty, foreigners were asked to help me change it again and again, and the lunar calendar is still there. Anyone who has studied ancient history knows that China was very powerful in ancient times, always the first in this and that, and how many years ahead of foreign countries. Why can't foreigners use our algorithm when they come in the late Ming Dynasty?

The so-called lunar calendar and solar calendar are two different calendar calculations, and their reference objects are different. The lunar calendar, which is often said, is based on the moon. People call the moon's time around the earth "lunar month", with a period of about 29.53 days. For the convenience of conversion, the big month is 30 days and the small month is 29 days. The solar calendar is based on the sun, and the time for the earth to go around the sun is called the "solar year", which is about 365.25 days. Divided into 12 months, each month is about 30.44 days.

Because the moon is closer to the earth, it is easy to observe. Therefore, in ancient times, the "lunar calendar" was more widely used, such as eight-character fortune telling, marriage, building a house to see the sky, and the old calendar was based on the "lunar calendar". In the folk, birthdays are basically based on the "lunar calendar", especially in rural areas, birthdays are basically calculated according to the lunar calendar; People in the city prefer birthdays in the solar calendar, but in modern times, they are not very particular about it. Even the birthdays of the lunar and solar calendars should be celebrated.

Careful friends may observe that the time of the lunar calendar is about eleven days worse than that of the solar calendar every year. According to the lunar calendar, we will celebrate the Spring Festival in summer in less than five years. However, this did not happen. This is a kind of calendar calculation of "harmony of yin and yang" initiated by our clever ancients, which is called "Yin and Yang Calendar", which is what we often call "Lunar Calendar"!