What does birthday mean?

In ancient times, we adopted the chronology of the official branch (heavenly stems and earthly branches), so a person's date of birth can be expressed by the official branch (such as Wuwu, Wuwu, Wuwu, Wuwu, Wuwu). There are four parts, each part is like a pillar, and the four parts are four pillars, referred to as "four pillars". And each part has two words, and a * * * is eight words, so it is called "eight characters". It can be seen that the eight characters refer to eight branches representing the year, month and day. This is the definition of eight characters. Four pillars refer to the combination of four parts representing year, month and day. This is the definition of the four pillars.

As can be seen from the above, the meaning of eight characters and four pillars is the same, so eight characters can also be called four pillars, which is commonly known as four pillars, just as the scientific name of salt is sodium chloride, commonly known as salt.

In practice, we can often call the eight characters "four pillars and eight characters" or "birthday" in this way, which have the same meaning and all refer to the eight characters.

The knowledge of predicting fate with four pillars and eight characters is called "four pillars prediction" or "eight characters prediction", "numerology" or "numerology", "fortune telling" and "calculating eight characters". Sometimes we also refer to "four-column foresight" as "four-column foresight" and "eight-character foresight" as "eight-character foresight", so when we refer to "four-column foresight" or "eight-character foresight", we sometimes refer to the four-column foresight itself and sometimes to the four-column foresight. What it is depends on the context.