Jieqi (Solar Terms)
The moment when the sun moves 15 degrees along the ecliptic, there are 24 in a year. The month pillar in Bazi (Eight Characters) uses the 'Jie' (solar term) as its boundary.
Jieqi (Solar Terms) are time markers in the ancient calendar system used to denote seasonal changes, determined by the sun's position on the ecliptic, with a total of 24 in a year. These points not only reflect shifts in climate but also influence agricultural activities and daily life arrangements. In traditional Chinese metaphysics, the month pillar in Bazi charting is not based on the lunar calendar months but uses the 'Jie' (solar term) as the boundary for months. For example, Lichun (Start of Spring) marks the beginning of the Yin month, and Jingzhe (Awakening of Insects) marks the beginning of the Mao month. This distinction allows for metaphysical calculations to more closely align with actual astronomical cycles.