Why is there no lunar month with neutral atmosphere but no solar terms?

China's calendar is a yin-yang calendar, which is a combination of three calendars.

The lunar calendar is a lunar calendar, and the day without the moon (that is, the back of the moon faces the earth) is called the new moon, that is, the first day, and the full moon is called the moon, sometimes it is fifteen, sometimes it is sixteen. A lunar month is a lunar month with an average of 29.53 days, which is 354-355 days after 12 months.

The solar calendar is the solar calendar, that is, the time for the earth to make a circle around the sun is about 365.24 days, and the solar term is the solar calendar, that is, the position of the earth on the ecliptic (the orbit of the earth's revolution), so that there is a time difference of about 10 days between the solar calendar and the lunar calendar every year.

The solar calendar is also the Gregorian calendar, which is internationally accepted. The Gregorian calendar is customized based on 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 accumulates to *** 1 day, and is added to February of the fourth year, which 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, and there is no difference between a normal year and a leap year.

The lunar calendar does not consider the movement of the earth 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, the so-called yin-yang calendar. The summer calendar still in use in China (some people call it lunar calendar or lunar calendar) 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 also adopts the method of adding leap months to make the average number of days in each year close to the number of days in the solar calendar to adjust the four seasons. Every two or three years, there will be an extra leap month in the summer calendar. The lunar calendar, also known as the lunar calendar, takes the moon's orbit around the earth as one month and the earth's orbit around the sun as one year, which is actually equal to the lunar calendar. This calendar was adopted in China before the first year of the Republic of China, so it is called the old calendar. Most people think that the lunar calendar is suitable for farmers, and the name of this day is "Lunar Calendar".

The orbit of the moon is called the white road. Both the ecliptic and the ecliptic are two great circles on the celestial body, intersecting at an oblique angle of five degrees and nine minutes. The moon goes around the earth once, and people appear on the ecliptic twice, lasting 7 hours and 43 minutes 1 1.5 seconds on the 27th, which is the time required for the first anniversary of the moon's revolution. It is called "the moon and the stars". Only when the moon revolves around the earth, the position of the earth changes because of its revolution, counting forward more than 27 degrees, and the moon runs at 13 degrees 15 minutes every day, so it takes 29 12, 44 minutes and 2.8 seconds to return to the moon, which is called "the full moon". According to custom, January means the full moon.

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. Every year, the new moon near beginning of spring is the beginning of the year. The earth goes around the sun once, that is, the moon goes around the earth for twelve and a third times. The number of months in a year cannot be odd zero. So there are only 354 days in twelve months of a year. Compared with the actual year, there are about eleven days left, which adds up to three years and thirty-three days. So every three years, we must make a leap month, with three or four days left, then two years left, and 25 or 26 days left. Leap month is a month without festivals, a year with leap month is a leap year, a leap year has thirteen months and a normal year has twelve months.

Therefore, due to the need of production, the month without gas is designated as leap month, which is the so-called turtle butt-turtle butt.