What does February 22nd mean?
A kind of calendar. According to the cycle of the moon phase change (that is, "looking at the moon"), because the ancients called the moon "lunar calendar", it is called "lunar calendar" for short.
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.
The relationship between solar calendar and lunar calendar;
The Gregorian calendar is also an international Gregorian calendar. The Gregorian calendar is customized according to the time that the earth revolves around the sun for one year, ***365 days, 5 hours, 48 minutes and 46 seconds. The average year is only an integer of 365 days, not a mantissa; A year is divided into 12 months, big month 3 1 day, small month 30 days, and February only has 28 days. The mantissa of four years accumulated to about *** 1 day, and it was added to February of the fourth year. This year is called leap year, so February in leap year has 29 days.
The lunar calendar orders a full moon for one month, ***29 and a half days. For the convenience of calculation, the big moon is customized for 30 days and the small moon is customized for 29 days. In 12 months of a year, large and small months are generally arranged alternately. The lunar calendar has only about 354 days a year. Generally speaking, there is no difference between a normal year and a leap year.
The lunar calendar does not consider the earth's revolution around the sun, so the changes of the four seasons in the lunar calendar have no fixed time and cannot reflect the seasons, which is a great shortcoming. In order to overcome this shortcoming, people later decided on a compromise calendar, which is the so-called lunar calendar. The summer calendar (also called lunar calendar) that China is still using now is this kind of lunar calendar.
Like the lunar calendar, it also customizes a month according to the time when the moon is full and short, which is 30 days for the big month and 29 days for the small month. However, it adds leap months to make the average number of days in a year close to the solar calendar, so as to adjust the four seasons. In the summer calendar, there is an extra leap month every two or three years.
The lunar calendar, also known as the lunar calendar, takes the moon's orbit around the earth as a month and the earth's orbit around the sun as a year. China adopted this calendar before the first year of the Republic of China, which is symmetrical with the current calendar, hence the name "Old Calendar". Most people think that the lunar calendar is suitable for farmers, but the name of this day is "Lunar Calendar". Careful study shows that there is a difference between the lunar calendar and the lunar calendar.
The lunar calendar, as its name implies, is a calendar that guides agricultural production and is divided into 24 solar terms. Because the number of days in a month cannot be odd zero, a month in the lunar calendar is the 29th or 30th. Every month is headed by the day of the first day, that is, the first day. The first day of the first month of each year (the first month in which the gas and rain are located) is the first day of the year.