Conversion from lunar calendar to solar calendar: how to convert lunar calendar into solar calendar

Whether we look up the yellow calendar, ordinary books or some ordinary calendars, we will see that there are two versions of the lunar calendar and the Gregorian calendar. Although we all know what these two chronologies are, do you know how the Gregorian calendar and the Gregorian calendar are converted? What is their official introduction? Follow me to the agricultural calendar.

1. What is the solar calendar?

The solar calendar, also known as the solar calendar, is a calendar based on the movement cycle of the earth around the sun. The calendar year of the solar calendar is approximately equal to the tropic year, and a year is 12 months. This month has nothing to do with the first lunar month.

The month and date of the solar calendar are very consistent with the position of the sun on the ecliptic. According to the date of the solar calendar, we can clearly see the changes of cold and warm seasons in a year. But every month, you can't see the new moon, the new moon and the new moon.

At present, the Gregorian calendar, which is commonly used in the world, is a solar calendar, with 365 days in a normal year and 366 days in a leap year. It leaps every four years, once every hundred years, and once again in the 400th year, that is, there are 97 leap years every 400 years. The average length of the Gregorian calendar is only 26 seconds away from the tropic year, and it takes only one day to accumulate 3300 years.

Second, what is the lunar calendar?

Lunar calendar, also known as summer calendar, lunar calendar and old calendar, is one of the traditional calendars in East Asia. The lunar calendar belongs to a kind of lunar calendar, and an average calendar month is equal to a new moon. However, the leap month is set to make the average calendar year a tropic year, and the 24 solar terms are set to reflect the changing characteristics of the seasons (the annual movement of the direct point of the sun), so there is also a solar calendar. Up to now, almost all China people, North Korea, South Korea, Viet Nam and Japanese still use the lunar calendar to calculate traditional festivals such as Spring Festival, Mid-Autumn Festival and Dragon Boat Festival.

Normal year 12 months, 30 days in the big month, 29 days in the small month, and 354 or 355 days in the whole year (which month is older and which month is younger varies from year to year). Because the number of days in each year is about 1 1 day worse than that in the solar year, the method of setting leap months is adopted to exhaust the average number of days in these years.

The lunar calendar is close to 365.2422 days. Because the tropic year of 1 is 12.368 moons, and 368/ 1000=46/ 125, 46 leap years should be set in 125 years. However, because it is too complicated to set the jump like this, it is estimated that 7/ 19 is closest to 0. According to the position of the sun, a solar year is divided into 24 solar terms to facilitate agricultural planting and other activities. Chronology is matched with heavenly stems and earthly branches, and it is a cycle of 60 years. According to legend, this calendar originated in the Xia Dynasty, so it is also called the Xia calendar. Also called the old calendar.

Because the twenty-four solar terms are of great significance to agricultural production, people often refer to the summer calendar as the lunar calendar, but the twenty-four solar terms should be determined according to the position of the sun on the ecliptic and belong to the solar calendar. Therefore, it is not appropriate to call the summer calendar the lunar calendar.

3. How are the lunar and solar calendars converted?

The first day of each month is called the new moon, and the last day is called darkness. The fifteenth, sixteenth or seventeenth day of the lunar calendar is called Wangwang, and the day after Wangwang is called Wangwang, so every year's Lunar New Year's Eve is not on the same day. The basis of the lunar calendar is the tropic of Capricorn and the first moon. The tropic year is the time required for the sun to pass through vernal equinox twice in a row, that is, 365.2422 days (365 days, 5 hours, 48 minutes and 46 seconds). "The first month of the lunar calendar" is the time between two consecutive new moons (new moons) or two full moons (full moons), that is, 29.5306 days (June 29th 12 hours, 44 minutes and 3 seconds).

Because 12 "Wang Shuo Moon" is only 354.3672 days, which is more than 10 days different from 365.2422 days in the tropic year, this difference accumulates and becomes a leap month. As early as the Spring and Autumn Period in 500 BC, the calendar of China adopted the arrangement of 7 leap months in 19 years. However, the calculation method of the lunar calendar in China is different from that in Tibet and South Korea, and there is generally a difference of one or two days.

The date of the lunar calendar is based on the full moon, which takes each new moon as the first day, the full moon as the fifteenth day (the sixteenth day of the big moon) and the dark moon as the twenty-ninth day (the thirtieth day of the big moon). However, at present, the date of the solar calendar is usually used to express the time. If you want to convert the date of the solar calendar into the date of the lunar calendar, you can use the following two methods: one is to view the newly edited perpetual calendar, for example, what day is June 8 of the lunar calendar 1984? Turning to the perpetual calendar, June 10 is the first day of November in the lunar calendar, so it is inferred that June 8 is the ninth day of September in the lunar calendar.

Secondly, the lunar calendar date can be calculated by the following formula: Let: the number of years in AD-1977 (or1901) = 4q+r; Then: lunar calendar date =14q+10.6 (r+1)+what date of the year -29.5n (Note: in the formula, q, r and n are all natural numbers, r.

Example: The lunar calendar date of May 7th 1994 is:1994-1977 =17 = 4? 4+ 1

So: Q = 4, R = 1, then: the date of the seventh day of the fifth lunar month is: 14? 4+10.6 (1+1)+(31+28+31+30+7)-29.5n = 204.2-29.5n, and then use 204.