数九天 Traditional form: 數九天 Pinyin (reading): shǔjiǔtiān Definitions: nine periods of nine days each after winter solstice, the coldest time of the year Characters: 数 - count, number, several 九 - nine 天 - sky, heaven; god, celestial Traditional characters: 數 - count, number, several 九 - nine 天 - sky, heaven; god, celestial