Group 1 - The beginning of spring is marked by the arrival of Lichun, which typically occurs on February 3rd, 4th, or 5th in the Gregorian calendar [4][3] - The concept of "counting the nines" starts from the winter solstice, totaling 81 days, indicating the cold period of winter [1] - Lichun signifies the start of spring farming activities and is associated with the agricultural calendar, indicating a fruitful year ahead [3][4] Group 2 - There are interesting phenomena related to Lichun, such as "no spring year," "single spring year," and "double spring year," which refer to the occurrences of Lichun in the lunar calendar [4] - The upcoming lunar year of the Horse will have only one Lichun on February 4, 2027, categorizing it as a "single spring year" [7] - Lichun can coincide with the Spring Festival, creating a unique overlap that signifies the start of both the solar and lunar new years [7]