Heavenly stems and earthly branches and the 24 solar terms.

At the beginning of chaos, Tai Chi gave birth to two instruments, two instruments gave birth to four elephants, and four elephants gave birth to four sides.

365 days a year, 12 months, 24 days is a unit.

Eight directions: North Ridge (water), Northeast Ridge (mountain), East Earthquake (thunder), Southeast Ridge (wind), South Ridge (fire), Southwest Ridge (ground), West Ridge (jersey) and Northwest Ridge (sky).

Ten-day stem: methyl, ethyl, propyl, butyl, heptyl, decyl and sunflower.

Twelve earthly branches: ugly Mao Yinchen has asked for an audience at noon.

Comparison table between twelve o'clock and twenty-four sections

Yin: beginning of spring, rain, hair: fright, vernal equinox.

Chen: Qingming, Grain Rain, already: long summer, small man.

Noon: awn seed, summer solstice, no: light heat, great heat.

Shen: beginning of autumn, early summer, especially: white dew, autumn equinox.

Xu: Chu Shuang, Hai: beginning of winter, Xiaoxue.

Son: heavy snow, winter solstice, ugliness: slight cold, severe cold