Is the night long or the day long in early autumn?

The night after beginning of autumn is long. Beginning of autumn is the first 13 of the 24 solar terms and the first solar term in autumn, which falls on August 7-9 of the Gregorian calendar every year. In autumn, the direct point of the sun moves southward from1132 ′ n to 5 57 ′ n. As the direct point of the sun moves southward, the daytime time is shortened, the sunshine hours are reduced day by day, and the light and heat given to the northern hemisphere are also reduced day by day. The weakening of solar radiation gradually reduces the heat available on the ground during the day. But with the extension of the night, the heat radiated from the surface to space increases. As the heat absorbed by the ground is gradually less than the heat lost by the ground, the temperature begins to change from high to low.

Traditional customs:

The beginning of Mid-Autumn Festival: Autumn is the harvest season, and people have the custom of offering sacrifices to the land gods and celebrating the harvest. There is a custom of "beginning of autumn gnawing autumn melons" in the south. Eat more watermelons in autumn to prevent autumn dryness and form a custom for a long time. The Records of the Capital published in the Republic of China recorded: "beginning of autumn ate watermelon the day before, which is called gnawing autumn." It also means welcoming the arrival of autumn. Sunbathing in autumn is a typical agricultural custom phenomenon with strong regional characteristics. Villagers living in mountainous areas such as Hunan, Guangxi, Anhui and Jiangxi. It has become a traditional agricultural custom to use the roof in front of the house and the window sill to hang crops.