The Chinese believe there are 12 meridians [十二 经络] in the human body and each has a 2 hour period where qi (energy) is the peak.

These twelve meridians are similar to rivers of energy that carry qi throughout our bodies. Any disruption to the flow of energy can cause health problems and behavioral problems.

By observing the time of your birth, we can infer our physical nature [先天 体质] and what our nature and fortunes are based on the time of birth. Most Chinese people believe in predicting the hour of birth that they still believe in the balance between humans and nature.