A scholar and a group of monks in the Tang Dynasty in China, what calendar did he make?

Monk and his team, his real name is Zhang Sui. An outstanding astronomer in the Tang Dynasty calculated the length of meridian latitude for the first time in the world and compiled Dayan Calendar. The leader of Tantric Sect is the author of Tantric authoritative book The Great Sun Sutra. Han nationality, a native of Changle, Weizhou (now Nanle County, Henan Province), is called Julu people. The great-grandson of Zhang, a hero of the Tang Dynasty, whose father was a martial arts magistrate. Tang Gaozong Hongdao was born in martial arts in the first year, and Xuanzong died in Huayan Temple in Chang 'an in the fifteenth year of Kaiyuan.

A line, some astronomers in ancient China, is also the organizer of tantric teachings. He was born in the first year of Hongdao in Tang Gaozong (683) and died in October of the 15th year of Emperor Xuanzong of the Tang Dynasty (727) at the age of 45.

A group of monks

In the first ten years of Emperor Xuanzong's reign, Yao Chong and Song Jing were appointed as prime ministers to govern the country. At that time, there was a famous Great Sage in Buddhism-thich nhat hanh. Tang Xuanzong not only revered him, but also regarded him as a Buddhist (see History of Buddhism). In our country, people generally follow a summer calendar, which is also called the "lunar calendar" because it conforms to farmers' farming all year round. Many people know that the Xia calendar originated in the Xia Dynasty, but after detailed arrangement and correct revision, it was written by a Buddhist sage-thich nhat hanh. I'm afraid few people know it.