The origin of the China lunar calendar? A story about it?

Lunar calendar is one of the traditional calendars in China, also known as lunar calendar, ancient calendar, Han calendar, yellow calendar, summer calendar and old calendar.

Origin: All countries with ancient cultures, such as Egypt, Babylon, India, Greece, Rome and China, originally used the lunar calendar. Because the moon's profit and loss cycle is very obvious, 29 or 30 days is called a month, and 12 months is called a year, which became the original calendar of ancient countries.

Story:

The lunar calendar is one month long, that is, the cycle of the moon circling the earth is about 29 and a half days; The sun is one year older, that is, the period of the earth going around the sun is about 365 days and a quarter of a day. If 12 months is taken as a year, then there are only 354 days or 355 days, which is almost different from the solar year 1 1 day. 10 years later, there was frost and snow in June, sweating in December, and inversion in winter and summer.

After the slow development of agriculture in ancient countries, it was found that the agricultural season and climate could not match the lunar calendar, January, spring, summer, autumn and winter. In order to solve the contradiction between the lunar calendar and the solar calendar, there were two ways in ancient times:

One method is to give up the moon's gain and loss in the lunar calendar as the method of calculating months, and take the year when the sun returns, that is, 365 and a quarter years, as a year, and divide the year into 12 months, 365 days in a normal year, 366 days in a leap year and 4 years in a leap year. This is the method adopted by western Rome in 46 BC.

Another method is to find out the least common multiple between the number of days in the solar calendar year and the number of days in the lunar calendar month, which is the seven-leap method in the 19th year of Zhuan Xu calendar in ancient China. Because the number of days in 235 months of the lunar calendar is equal to the number of days in 19 solar year.

Extended data:

Lunar calendar algorithm:

Lunar calendar, its calculation method is: one week of lunar eclipse is a month, lasting 29 days 12 hours, 44 minutes and 2.8 seconds, and 12 weeks of lunar eclipse is a year, lasting 354 days, 8 hours, 48 minutes and 33.6 seconds. In 12 months every year, there are 6 odd-numbered months (i.e. 1, 3, 5, 7, 9, 1 1) as "big construction", and each month is 30 days; Six even-numbered months (February, April, June, August, 10, 65438+ February) are "Xiao Jian", and each month has 29 days; In leap year, the month of 65438+February will be changed to 30 days.

The calendar takes 30 years as a cycle, and the 2nd, 5th, 7th, 10, 13, 16, 18, 2 1, 24th, 26th and 29th years in each cycle are * */. Therefore, the average annual time is 354 days, 8 hours and 48 minutes.

According to the actual number of days over the years, it is about 10 days less than the return, 2 1 hour, 1 minute, and the tropic year of 2.7 is one year different from the tropic year of 32.6. In this calendar, the calculation of day and night begins at sunset and ends at sunset the next day, which is usually called before the night trip, that is, the night is before and the day is after, forming a day.

Baidu encyclopedia-lunar calendar