sān jiǔ tiān
the twenty seven days after the Winter Solstice, reputed to be the coldest days of the year
shǔ jiǔ tiān
nine periods of nine days each after winter solstice, the coldest time of the year
jiǔ tiān
the Ninth Heaven
the highest of the heavens
jiǔ tiān lǎn yuè
to reach for the stars (idiom)
Jiǔ tiān Xuán nǚ
Xuan Nü, a fairy in Chinese mythology