The lunar calendar is the same as the lunar calendar, isn't it?

Generally speaking, it's the same. "For example, today is the third day of the lunar calendar, is it also the third day of the lunar calendar?" Correct. Deep discussion: the lunar calendar is based on the cycle of the moon (that is, the moon). Because the ancients called the moon the lunar calendar, it is also called the lunar calendar, which is a pure lunar calendar. In China, the term "lunar calendar" is used, and most people call it "lunar calendar", which is wrong. The lunar calendar is not a pure lunar calendar, but a "yin and yang calendar". The lunar calendar takes the full and short periods of the moon as one month, and 12 months as one year. However, the moon has a full moon, which is 29 days, 12: 44: 3, which is more than 29 days and less than 30 days. For convenience, the lunar calendar divides months into two types: big month and small month. 30 days a month, 29 days a month, 354 days a year. In fact, the new moon is not exactly equal to the average of the big moon and the small moon-29 days and a half, but 44 minutes and 2.8 seconds more than 29 days and a half. So 12 moon is actually 8 hours, 48 minutes and 34 seconds longer than 354 days, and it will be 1 1 day in 30 years. Therefore, a leap year 1 1 will be inserted in the 30 years of the lunar calendar, and an extra day will be added in the 12 months of each leap year. The leap year in the lunar calendar is 355 days. So every 30 years, the lunar calendar has 19 354 days and 1 1 355 days, and the average length of a year is 354 days, 8 hours and 48 minutes. Its year is almost shorter than the tropical year 1 1 day. In three years, we lost more than a month, and 17 lost more than half a year. So with this length of time, the New Year doesn't have to be spent in winter, but it can be spent in spring, summer and autumn. Its only advantage is that the shape of the moon can be known on every date of the lunar calendar. As a calendar, the lunar calendar is not in harmony with agricultural production and people's daily life, so in today's world, except for a few Islamic countries that are still in use for religious reasons, other countries have generally abandoned it. The lunar calendar takes the time of the first month of the lunar calendar as the average time of the calendar month. This is the same as the pure lunar calendar, but the lunar calendar adopts the method of setting leap months and 24 solar terms, so that the average length of the calendar year is equal to the tropic year, which has the elements of the solar calendar, so it is better than the pure lunar calendar. It is said that our ancestors used this calendar in all lunar calendars as early as the Xia Dynasty (before17th century BC). So people also call it the summer calendar. After liberation, it was still called the summer calendar. After 1970, it was renamed as the "Lunar Calendar" in China. As for the origin of the name "lunar calendar", it is probably because the country has been founded on agriculture since ancient times, so the calendar must serve agriculture. The lunar calendar is based on the new moon. The time of the first lunar month is 29th 12 hours, 44 minutes and 3 seconds (that is, 29.5366 days), so the lunar calendar is also 30 days for the big month and 29 days for the small month, but it is not exactly the same as the pure lunar calendar, because the pure lunar calendar is arranged alternately with big and small months, and the size and month of the lunar calendar are determined by calculation. The first day of each month in the lunar calendar happens to be a "new moon" (that is, the moon is in the middle of the sun and the earth faces the earth with half of the darkness). Sometimes there may be two big months or two small months in a row. Because the first month of the lunar calendar is slightly longer than 29 and a half days, there are about 53 big months and 47 small months in every 100 calendar month of the lunar calendar. The lunar calendar basically takes1February as a year, but the time of 12 lunar month is 354.3667 days, which is about 1 1 day different from the tropical year. In this way, there will be 33 extra days every three years, that is, one more month. In order to eliminate the extra days, one month is added every three years, which is the leap month of the lunar calendar. A year with a leap month is also called a leap year. Therefore, the lunar leap year has 13 months. As for the leap month, it is determined by the solar terms. China calendar has a long history. "History? Yao Dian has "What is the fate, Qin Ruohao's sky, calendar like the sun, the moon and the stars, respecting the people", "The stars and birds are in the sun, Yin Zhongchun; The sun is always shining for midsummer; In the night, the stars are empty and there is a cloudy Zhong Qiu; It is recorded that the short star in the middle of winter has six days in 360 years, and the leap month will set the age at four o'clock. Although Shangshu was entrusted by later generations, it was not enough to prove that the length of each tropical year was 366 days at that time, but for agricultural activities, "year" was the most important cycle. This is what people in primitive society got from production practice. The calendar of our country adopts the method of counting branches. Before the Eastern Han Dynasty, only days were recorded, and years were recorded after the thirty years of Jianwu (54).