三九天 Traditional form: 三九天 Pinyin (reading): sānjiǔtiān Definitions: the twenty seven days after the Winter Solstice, reputed to be the coldest days of the year Characters: 三 - three 九 - nine 天 - sky, heaven; god, celestial Traditional characters: 三 - three 九 - nine 天 - sky, heaven; god, celestial