1. Historical origin
Night refers to the time period from sunset to before sunrise the next day. Night, as a concept of time, has a long history.
As early as the pre-Qin period, the basic concept of "night" was already present at night, but the word was not popular. According to "Book of Jin Astronomical Records", ancient astronomers measured time based on the changes in the four seasons and the intersection of yellow and red, so "night" did not appear to be very important in their time calculations. The residents below keep time according to the rising and setting of the sun. This concept of time was perfected in the "Lü Li Zhi" of M times in the Tang Dynasty, laying the foundation for today's concept.
2. Connection with physiological time
The human body has an internal clock, which allows people to perceive time and regulate people's physiological rhythms. This internal clock is controlled by the pineal gland, located in the brain, and is primarily regulated by light. After the sun sets at night and the light gradually dims, the pineal gland secretes melatonin, thereby regulating people's sleep and metabolism. It is precisely because of this physiological adjustment that night has become a time for people to rest, sleep and have fun.
3. Cultural customs
Evening has always been a time for people to have various entertainments and gatherings. This cultural custom has different manifestations in different regions and countries. For example, China's night market culture has always been an important place for people to shop, taste delicious food, and enjoy flowers and scenery at night. In Europe and the United States, evening is the best time for people to gather and socialize, and entertainment activities are especially rich and colorful. In addition, in some countries and regions, evening is also a time for celebrations and religious ceremonies.
4. Origin of the name
The night is collectively referred to as night, which often arouses people's curiosity. In fact, the word "night" first appeared in poetry in the Tang Dynasty, originally referring to the changes in celestial phenomena when night falls. Later, as the meaning of time expanded, night gradually evolved into a concept of time paragraphs. The word itself does not have any profound connotation, it is just a habitual name used by everyone in daily life.