The most important thing about an individual's lifespan, and one fixed by heaven above, is his birth horoscope, in other words the particular combination of Heavenly Stems and Earthly Branches that define the year, month, day and hour of birth and so yield a person's Eight Cyclical Characters.
個人時間中，最重要、也是上天註定的，首推「生辰」，以年、月、日、時配以天干及地支，就產生了一個人的「生辰八字」。