Brief introduction of the author of the new practical perpetual calendar

Mr. Qin, male, 1939, from Machang Town, Shuyang County, Jiangsu Province. He was born in a family of traditional Chinese medicine, and he was a favorite pupil of Yin, a famous Yi-ology scholar. He has been engaged in the study of the Book of Changes for more than 50 years, devoted himself to the study, persevered and made some achievements.

Mr. Qin has profound attainments in traditional Chinese medicine and Yi-ology, and has participated in many international academic seminars on Zhouyi. Appointed as "Professor of Mathematics" and "Senior Predictor" by expert judges.

Mr. Qin is currently the vice president of China Heluo Yijing Research Association, the senior forecaster of China Scientific Prediction Research Association, the director of Harbin Ancient Yijing Research Institute in China, and the director of China International Yijing Application Research Association. He is usually the principal of Harbin Yijing Training School, the director and visiting professor of the Yi Institute of Aopei College of Harbin Normal University. The author's wish for many years is to combine the secret biography of his tutor with his 50 years' experience in the study of the Book of Changes to write a book dedicated to the society and to solve doubts for readers.