Why should there be a Gregorian calendar and a lunar calendar?

The lunar calendar, also known as the summer calendar, is said to have originated in the Xia Dynasty in China. It is very scientific and practical, so it has been handed down to this day. The lunar calendar is divided into four seasons, 24 solar terms, and annual festivals according to the natural days of the year.

The 24 solar terms of the lunar calendar include: the beginning of spring, rain, surprise, vernal equinox, Qingming, and valley rain; In summer, the beginning of summer, Xiaoman, mangzhong, summer solstice, small summer, and great heat; the beginning of autumn, the heat of the summer, the white dew, the autumn equinox, the cold dew, and the frost fall; The beginning of winter, light snow, heavy snow, winter solstice, small cold, and big cold in winter. In addition, the months of the year are set according to the moon phase cycle.

That is, the big month is 30 days, and the small month is 29 days. The first day of the lunar month is called "Shuo", and the fifteenth day of the month is called "Wang". On the New Year's Day, the Moon orbits between the Sun and the Earth, and the shadow faces the Earth and appears at the same time as the Sun, so that the Moon cannot be seen.

On the day of "looking", the earth moves between the sun and the moon, the sun sets in the west, and the moon rises in the east, so that the full moon can be seen. Since the lunar year is about 355 days, which is about 11 days different from the earth year, there is a leap month every 3 years and 7 leap months every 19 years. A year with a leap month is also called a leap year, and the specific leap month depends on the solar terms.

The lunar calendar is not only designated according to the time taken by the earth's return year but also according to the changes of the moon phases, and is based on the surrounding meteorological and phenological conditions and agricultural activities, which is highly practical, so it has become a calendar with distinct seasons and easy to remember. In China, the lunar calendar is especially applicable to the vast areas of the Central Plains.

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The Gregorian calendar was transmitted from the West. The lunar calendar is a traditional way to record time in China.

Whether the Gregorian calendar is lunar or gregorian calendar.

Why is there still Chinese law when there is international law?

The lunar calendar is a traditional calendar adopted in China, also known as the summer calendar, the middle calendar, the old calendar, and the folk also called the lunar calendar. It uses a strict synodic cycle to determine the month, and uses the method of setting leap months to make the average length of the year similar to the return year, and has the properties of both lunar months and solar years, so it is essentially a lunisolar calendar. The lunar calendar takes the date of the conjunction of the sun and the moon (the sun and the moon have equal ecliptic longitude) as the first day of the month, that is, the first day of the new month.

The average length of a synic month is about a day, so some months have 30 days. Weigh the moon big; Some months are on the 29th, which is called the small month. The date of the beginning of the month is calculated according to the position of the sun and moon and is not mechanically arranged.

The lunar calendar takes 12 months as a year, with a total of 354 or 355 days, a difference of 11 days from the return year. To this end, it is coordinated by inserting seven leap months every nineteen years. The arrangement of the leap month is determined by the 24 solar terms.

The lunar calendar takes the time of the full and missing moon once in one month, a total of 29 and a half days. In order to make it easier to calculate, the big moon pants are made for 30 days, the small month is 29 days, and in December of a year, the large and small months are roughly alternated. There are about 365 days in a lunar year, and there is no difference between ordinary and leap years.

The lunar calendar does not take into account the movement of the earth around the sun, so the change of the four seasons does not have a fixed time on the lunar calendar, and it cannot reflect the seasons in the open field, which is a big disadvantage. In order to overcome this shortcoming, people later set a new calendar, the so-called lunisolar calendar. The summer calendar (also called the lunar calendar or lunar calendar) that is still in use in China is this lunisolar calendar.

Like the lunar calendar, it is set as a month when the moon is full and absent once, that is, 30 days in the big month and 29 days in the small month, but it also uses the method of adding leap months to make the average number of days in a year close to the number of days in the solar calendar to adjust the four seasons. The lunar calendar has a leap month every two or three years. ～

Today's lunar calendar originated in the Spring and Autumn Period, based on the technical conditions at that time, the error was large and discontinuous (if used continuously, it would not only be "fifteen moons and sixteen rounds", but also seventeen and eighteen yuan). Based on the fact that the current calendar has been in use for more than 300 years, it is already "the fifteenth moon and sixteen rounds", and it is said that 2033 must also violate the "intercalation method" to set the intercalation, in order not to continue to expand the error between the lunar calendar and the lunar cycle, it is recommended to set up a simple lunar calculation method.

Method:1Chronological expression: a turtle b ming c year d month e day, (set 2 units larger than the year, 1 turtle = 16 ming, 1 ming = 19 years).

2.Let 1 Ming = 5 sections, 1 section = 3 sections, 15 months = 1 section, 17 months = 1 major section, 1 product = 1 section + 1 major section + 1 section = 47 months. There are 15 festivals per day, and the first month of the prologue is a leap month (year). Month = ,3Each ordinal odd month = 30 days, and the ordinal month = 29 days, (except for the turtle festival).

4.Make January 1 of every 1 year as the first day of the first month of the first product of the first product, and the first day of the first festival of every 3n Ming is the turtle festival, the odd month of the turtle festival = 29 days, and the even month of the order = 30 days, (that is, 5 days minus every 16 days).

In addition, after soliciting extensive opinions, the value of ABCDE was determined, and on the premise of ensuring that the current lunar date could be continued, a historically significant year was selected as the first month of the first year of the Yuan Gui Yuan Ming Dynasty.

This simple calculation method is calculated according to the moon's orbital period = every 15,200 years, which is smaller than the error of the Gregorian calendar. Fixed the big month and small month leap month, which is convenient for speculating the date and easy to convert with the Gregorian calendar; The lunar calendar year has been added to facilitate the concatenation of the emperor's years of the previous dynasties.

Please publicize it so that Chinese culture can be inherited and <> in the reform

Brief introduction to the origin of the lunar calendar:

The lunar calendar, formerly known as the summer calendar, lunar calendar, and old calendar, is one of the traditional East Asian calendars. The lunar calendar belongs to a lunisolar calendar, where the average calendar month is equal to a synodic month, but a leap month is set to make the average calendar year a return year, and 24 solar terms are set to reflect the changing characteristics of the seasons (the annual movement of the direct point of the sun), so it has the element of the solar calendar.

To this day, almost all Chinese in the world, as well as countries such as Korea, South Korea and Vietnam, and early Japan, still use the lunar calendar to calculate traditional festivals such as the Spring Festival, Mid-Autumn Festival, Dragon Boat Festival and other festivals.

There are 12 months in a normal year, 30 days in the big month, 29 days in the small month, and 354 or 355 days in the year (which month is older and which month is smaller in the year varies from year to year). Since the number of days in each year is about eleven days worse than in the solar year, the method of setting leap months is used to eliminate the average number of days in these years.

The approach of the lunar calendar. Since the return year of 1 is a synodic month, 368 1000 = 46 125, so there should be 46 leap years in 125 years, but because it is too complicated to set up a leap year in this way, it is estimated that 7 19 is the closest, so in general, there are 7 leap months in 19 years, and the year with leap months is 383 days or 384 days in the year.

According to the position of the sun, a solar year is divided into 24 solar terms, which is conducive to agricultural planting and other activities. The year is matched with the heavenly and terrestrial branches, and the cycle repeats itself over and over again for sixty years. This kind of calendar is said to have been founded in the Xia Dynasty, so it is also called the Xia calendar. Also called the Old Calendar.

Because the 24 solar terms are of great significance to agricultural production, people often refer to the summer calendar as the "lunar calendar", but the 24 solar terms should be determined according to the position of the sun on the ecliptic and should belong to the solar calendar. Therefore, it is inappropriate to call the summer calendar the lunar calendar.

It is a calendar based on the cycle of the earth's revolution around the sun. China's Ganzhi calendar belongs to this kind of calendar.

The calendar year of the solar calendar is approximately equal to the return year, which is 12 months of the year, and this "month" is actually unrelated to the synodic month. The months and dates of the solar calendar are in good agreement with the position of the sun on the ecliptic, and according to the dates of the solar calendar, the changes in the four seasons can be clearly seen in the year of one-click tenants;

But in each month, the moon's new signs, hopes, and strings are not visible. The Gregorian calendar that is now used in the world is a kind of solar calendar, with 365 days in a normal year, 366 days in a leap year, a leap every four years, a leap once every 100 years, and then a leap in the 400th year, that is, 97 leap years every 400 years. The average length of the calendar year in the Gregorian calendar is only 26 seconds away from the return year, and it is only one day to accumulate 3,300 years.

Because the lunar calendar is divided according to the changes of the moon, it is also called the "lunar calendar", and the Gregorian calendar is according to the changes of the sun, so it is called the "solar calendar". The lunar calendar is also known as the summer calendar, and according to legend, the origin wheel is pure lack of the Xia Dynasty in our country. It is very scientific and practical, so it has been handed down to this day.

1. The Gregorian calendar is called the "Gregorian calendar". The lunar calendar is also called the "lunar calendar".

2. The calculation method is different. The Gregorian calendar counts a year based on the time the Earth orbits the Sun. Its length is three hundred and sixty-five days, five hours, forty-eight minutes and forty-six seconds.

Since it is not an integer, in order to level out the length, some years are 366 days, which is called "leap years"; Some years are 365 days and are called "common years". The lunar calendar is based on the cycle of the moon's waxing and waning, known as the synodic months.

3. The number of days in a year is different, and the length of the solar calendar is 365 days, 5 hours, 48 minutes and 46 seconds. Since it is not an integer, in order to level out the length, some years are 366 days, which is called "leap years"; Some years are 365 days and are called "common years". The main features of the lunar calendar are:

The length of the calendar month is determined according to the celestial phenomenon, that is, the phase of the moon, with the 30th day of the big month rotting and the 29th day of the small month.

4. The scope of use is different. The Gregorian calendar is a calendar used by all countries in the world. , which is the solar calendar, that is, the solar calendar. The lunar calendar is the calendar used by all Chinese dynasties. It began in the Xia Dynasty, so it is called the lunar calendar, and it has been constantly modified in successive dynasties, and later after adding 24 solar terms, it has become a lunisolar calendar.