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/kloc-. 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.
The Gregorian calendar is also a solar calendar, which is internationally accepted. Since the first year of the Republic of China, China has adopted the solar calendar, which is symmetrical with the old calendar of China. The solar calendar is also called the "new calendar". The solar calendar takes one year for the earth to make a circle around the sun. A total of 365 days, 5 hours, 48 minutes and 46 minutes. An average year is only an integer of 365 days, not a mantissa.
The solar calendar is divided into 12 months, 3 1 day for the big month, 30 days for the small month, and only 28 days in February. It is also stipulated that before July, a single month is a big month and a double month is a small month; After August, two months are big months and one month is small months. The remaining 5 hours, 48 minutes and 46 seconds each year, there is only one day in about four years, and this day is added in February of the fourth year. This year is called leap year, so February in leap year has 29 days.
Extended data
Because the calculation methods of Gregorian calendar and Chinese calendar are different, the number of days in each year is different, and the starting time of the first day of each year is also different, so the months and dates of Gregorian calendar and Chinese calendar are out of sync, with a difference of about one month.
Because the Chinese calendar has always been used in the history of our country, most places in our country determine people's birthdays according to the lunar calendar when they were born, which is also a national habit.
On formal occasions, the year of birth is Gregorian calendar, such as ID card, record, resume, etc. It is easy to understand the above situation by looking at the calendar. Gregorian calendar dates are generally represented by Arabic numerals, and lunar calendar dates are represented by China numerals under Arabic numerals.
Baidu Encyclopedia-Lunar Calendar (China Traditional Calendar)
Baidu encyclopedia-lunar calendar
Baidu encyclopedia-Gregorian birthday