Is there any trick to calculating the square of hexagrams?

What's the name of the fortune teller?

Fortune teller. Fortune teller was a profession in ancient China. It is believed that by observing the changes of celestial bodies and meteorology, we can predict the good or ill luck in the future. These people are called "fortune tellers" or "astrologers". In ancient times, as long as you have profound knowledge, you can be called "Mr." There are still many old masters in today's society. Although they have retired, they are still very popular. The name "sir" seems too intimate. Fortune teller is a professional title of fortune telling, which uses personal information to predict or judge the good or bad fate and seek guidance.