The coldest days of the year, referring specifically to the period from the 19th to the 27th day after the winter solstice.

(idiom) to pluck the moon from the highest heaven; to achieve something very difficult or reach for a lofty goal

ancient Chinese Taoist goddess of war, sex, and longevity, also known as the Dark Lady of the Nine Heavens

The Mysterious Lady of the Nine Heavens; a Daoist goddess of war and longevity in Chinese mythology, said to have helped the Yellow Emperor defeat Chiyou.

The period of eighty-one days following the winter solstice, traditionally divided into nine sets of nine days each and considered the coldest time of the year.