数九，又称冬九九，是中国民间一种计算寒天与春暖花开日期的方法。一般“三九、四九”时最冷，是一年中最冷的时段。当数到九个“九天”（九九八十一天），便春深日暖、万物生机盎然，是春耕的时候了。
数九方法在中国民间口口相传，有历史但缺乏记载，至于起源何时，没有确切的资料。在传统文化中，九为极数，为“至阳”之数，又是至大之数，“至阳之数”的积累意味着阴气的日益消减，累至九次已到了头，意味着寒去暖来，“春已深矣”了。
Counting the Nine Days, also known as the Winter Nine Days, is a method used by the Chinese people to calculate the dates of cold days and spring flowers. Generally, the coldest days are during the "Third Nine Days and Fourth Nine Days", which are the coldest periods of the year. When nine "Nine Days" (ninety-nine eighty-one days) are counted, spring is deep and warm, and all things are full of vitality. It is time for spring ploughing.
The method of counting the nine days has been passed down orally among the Chinese people. It has a history but lacks records. As for when it originated, there is no exact information. In traditional culture, nine is the extreme number, the number of "extreme yang", and the largest number. The accumulation of "extreme yang number" means that the yin energy is gradually decreasing. When it accumulates to nine times, it has reached the end, which means that the cold is gone and the warmth is coming, and "spring is deep".

标签: