The eight characters are the eight characters of heavenly stems and earthly branches found in the calendar. Ancient scholars of Yin-Yang and Five Elements believed that there were five elements between heaven and earth. So, put heavenly stems and earthly branches on the five elements. The fate of a person's life is scrutinized from the five elements of "rushing punishment and making peace". So there is a theoretical basis, not superstitious at all.
The free horoscope here will list the five-line scores of the horoscope. Often the five elements with the lowest scores will bring good luck; Numerology calls it "XiShen" or "Useful God". On the contrary, the five elements with the highest score are unbalanced factors, which are called "fierce gods" in numerology.
Secondly, a concise "ups and downs of life" will be listed for your life reference. Finally, I will teach you how to seek good fortune and avoid evil, according to your "XiShen" and "evil spirits".
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Eight-character fortune-telling only needs the date and time of birth in the solar calendar. The horoscope does not need the lunar calendar time, because it only needs the solar term time in the sun, not the moon time.
Use standard time instead of daylight saving time. The time zone is China Beijing time. People born in China use a civil calendar; American-born people use calendars. I don't know when I was born, so I am not sure. Two hours before birth, consider using longitude time.