地支

wǔ yùn liù qì yǐ tiān gān dì zhī wéi jī chǔ

五运六气以天干地支为基础。

The theory of five movements six climatic changes is based on heavenly stems and earthly branches.

zhōng guó zài hàn wǔ dì yǐ qián yòng tiān gān dì zhī jì nián

中国在汉武帝以前用天干地支纪年。

Gan-Zhis were employed to designate the years before the reign of Wudi Emperor of Han Dynasty in China.