Is birthday accurate in solar calendar or lunar calendar?

This depends on which one you mean, each has its own characteristics. (Because the lunar calendar also includes the Gregorian calendar, the current Gregorian calendar is called the Gregorian calendar. )

First of all, one revolution of the earth is 365.2422 days, which is a tropic year. The solar calendar is established according to the law of the sun's movement (the ancients thought that the sun revolved around the earth), which is called the solar calendar. The Gregorian calendar directly stipulates that a year is 365 days, and then it is wetted every four years, which is equivalent to an average of 356.25 days a year. Then a hundred years of non-wetting is equivalent to an average of 365.24 days a year, and then 400 years of wetting is equivalent to an average of 365.2425 days a year. Here is basically close to the actual 356.2422, so we won't continue to polish it, otherwise the calculation rules will be too complicated (so every 3000 days in the Gregorian calendar). The advantage of this is that one day this year is almost the same as that of next year, so the climate this year is very close to that of next year, which is convenient for farming to master the right time.

Let's talk about the lunar calendar. In fact, the lunar calendar is also called the lunar calendar. As the name implies, it is a combination of the lunar calendar (based on the laws of the moon's movement) and the solar calendar. The solar calendar in China has only 24 solar terms, which are set by dividing a circle around the sun into 24 equal parts. So this year's solar term and next year's solar term (or the day between solar terms) are almost the same in earth orbit. In this respect, it is actually no different from the Gregorian calendar. The Gregorian calendar date corresponding to the 24 solar terms every year is basically the same day. For example, the solar term "Mangzhong" corresponds to the Gregorian calendar 2065438+. However, there are only 24 solar terms, which brings inconvenience to people's daily planning, so we combine the solar calendar with the lunar calendar to calculate which day of the lunar calendar corresponds to each solar term of that year (the 24 solar terms are not fixed months and days in the lunar calendar, but jump days, and lunar festivals are fixed months and days in the lunar calendar, so festivals and solar terms should be viewed separately). The lunar calendar is set in strict accordance with the laws of the moon's movement. A new moon (the moon goes around the earth once) is 29. Therefore, the lunar calendar has a 30-day full moon and a 29-day small moon, and each full moon appears at 15, which is very accurate (although there are months in the Gregorian calendar, it has nothing to do with the movement law of the moon. They abandoned the lunar calendar, but in order to take care of people's original habits, they kept the division method of one year 12 months. However, there will be a problem. Lunar calendar year 1 1 day is only 29.5X 12=354 days, which is about 1 day different from the actual 365.2422. Therefore, the lunar calendar will have a leap month every three years or so to pull back the error of the lunar calendar in the actual tropic year (the lunar calendar divides 24 solar terms into 12 ordinary solar terms and. The leap method is between two winter solstices. If it is only 12 months, there is no leap. If there are 13 months, then 13 months will be divided into 12. There was a leap in less than a month. The month without refueling is the leap month of last month. Because the exact time of the winter solstice is measured once a year, although it fluctuates greatly between two years, it is not as good as the Gregorian calendar. However, for thousands of years, the lunar calendar is theoretically not wrong with the actual tropic year, and it is more accurate than the Gregorian calendar. ) PS: It can be seen that a certain day this year and a certain day next year are not the same on the track based on the lunar calendar, and the error is within 30 days, so China's farming is not based on the lunar calendar, but on the 24 solar terms of the solar calendar.

Finally, I would like to sum up which is more accurate: the solar calendar and the lunar calendar are equally accurate for the earth's orbit as a reference system, but the lunar calendar is more troublesome to calculate, with only 24 solar terms, while the solar calendar is very intuitive. As far as the movement law of the moon is concerned (after all, many industries rely on the moon, such as fishing), the solar calendar and the lunar calendar are incomparable.