What is Sun's analysis of Heluo's books?

Sun's Book of Hutuluo is well analyzed. The interpretation of Hutuluo clearly explains the abstruse cosmic astrology in Hutuluo, which is very clear step by step, so that readers can understand its connotation quickly, so Sun's interpretation of Hutuluo is good. Hutuluo, two mysterious patterns handed down from ancient China, is a system for distinguishing time, direction and season according to the arrangement of stars in ancient times. The legend of Hutuluo was approved by the State Council to be included in the fourth batch of national intangible cultural heritage list. Analysis of Hutuluo is a book published by Academy Press, written by Sun.