The origin of perpetual calendar

"Calendar" is used by us to distinguish the changes of climate and solar terms. The role of the calendar is to let us know that time is changing, and at the same time record the date and time and set the standard for calculating time. As we all know, before China adopted the summer calendar, we used calendars such as the Shang calendar, but they were not accurate. Finally, after determining Kuafu's way of chasing the sun, we decided to adopt the current summer calendar, and we are now using the yellow calendar. Gregorian calendar and national calendar are different from our summer calendar. This calendar is a Roman calendar, which was created by the Greeks in the past. The Greek calendar was chaotic, and was later revised by the Roman Empire into the current international calendar, that is, the Gregorian calendar. China's Gregorian calendar is also the method we usually use to choose good luck or bad luck. Almanac mainly comes from a large number of data analysis that runs around the clock. In ancient times, when we didn't have the ability to record calendars, people couldn't judge day and night and solar terms, which brought great trouble to agricultural production. Later, from the era of the Yellow Emperor, people gradually calculated that the full moon was also a standard month. It was originally called the lunar calendar method, because the moon also represents the lunar star in our China culture, and the sun is the sun. After a fixed month, people gradually discovered the different changes of the four seasons, with different cold and summer, but many laws. After years of summary, another calendar was born, called the solar calendar. In other words, a year is determined by a cold and a hot summer. This is the basis of the earliest lunar calendar in China.