How are the four seasons divided?

According to Chinese folklore, the lunar calendar is used to distinguish the four seasons of the year, with the first quarter of 1, February and March as spring; April, May and June are the second quarter and summer; July, August and September are single quarters and autumn; 10, 1 1 and1February are four seasons and winter. The year of leap month is an exception, basically similar to the former. Folk customs are divided into four seasons according to the lunar month: January to March is spring, April to June is summer, July to September is autumn, and October to December is winter. Children are looking forward to "Year", which refers to the first day of the first lunar month; This day is not only the first day of the year, but also the beginning of spring in the division of lunar seasons, so it is called the Spring Festival.

In fact, the strict division should be: (according to China latitude) the first quarter: March-May (spring); The second quarter: June-August (summer); Section 3: 9- 165438+ 10 month (autumn); The fourth quarter:12-February (winter). On the calendar published by the state, there is also a lunar calendar next to the date of the AD calendar, also called the summer calendar, commonly known as the "lunar calendar".

Four seasons change mode. Seasonal change covers many characteristics such as climate change and phenological change, such as spring germination, summer prosperity, autumn harvest and winter storage, which indicates the development process of things. The division of the four seasons is based on the apparent position of the sun on the ecliptic, with the bisector, the second solstice or the fourth day as the boundary; However, the dividing points used by eastern and western countries to divide the four seasons are not exactly the same. The traditional method of dividing the four seasons in China takes the "four stands" in the 24 solar terms as the starting point of the four seasons, and the dichotomy and the two-to-one method as the midpoint. For example, in spring, the starting point is beginning of spring, the solar line is 3 15, the spring is divided into the midpoint, the long summer is the end point, the solar line becomes 45, and the sun runs 90 on the ecliptic. The rotation of the four seasons reflects the changing laws of phenology and climate. This is a traditional and common method of distinction.