Rain is the second of the 24 solar terms, generally around February 18 20 of the Gregorian calendar every year, when the sun's yellow longitude reaches 330°, indicating that the precipitation begins and the rainfall gradually increases.
The ancients divided the rain into three phases, one waiting for otters to sacrifice fish, two waiting for wild geese to come, and three waiting for plants and trees to sprout. That is, the rain season is coming, and the otters start fishing. Five days later, the geese began to fly back from the south to the north. After another five days, the grass and trees began to sprout as the yang energy in the ground rose.
After the rainy season, the rainfall slowly increases, but it is mostly light rain or drizzle. Most of the northern regions receive less than 10 millimeters of precipitation during the rainy season, while the southern cities receive abundant rainfall, reaching tens of millimeters of precipitation.
The first solar term after the beginning of spring is rain, which is considered to be a crucial day for the recovery of life. Folks believe that the elderly need to be "reborn" when they are full of a jiazi, so there is a custom of sending rainwater to the elderly, and it will take at least three years to send it, hoping that the elderly will be healthy. Some places will pull the godfather during the rainy season, which means "rain and dew moisturize and easy to grow". On this day, parents will take their children to find the right godfather.