The image above is taken from bazi-calculator.com 

 

In addition to the Four Pillars of birth (Year, Month, Day, and Hour), which never change, there is a fifth pillar that changes throughout life, with a periodicity of ten years.

This fifth Pillar is known as the Luck Pillar, a direct translation from the Chinese language, although it is neither inherently positive nor negative. Everything depends on the type of balance or imbalance existing in the Four Pillars (or Eight Characters) of birth.

A Luck Pillar, which lasts for periods of ten years, constitutes a positive or negative factor for a person’s life depending on whether it corrects or accentuates the imbalances existing in the Four Pillars chart.

Some degree of imbalance in the Four Pillars of birth is practically inevitable and natural. All forms of qi that correct this imbalance tend to create conditions for better utilization of personal potential. Conversely, what accentuates the imbalance of birth will be considered relatively unfavourable, that is, it will make the realization of personal potential more demanding.