The ancients used to refer to the first few days of the month of May as Duan respectively. Therefore, the first noon of the month of May (Wu) was called Duanwu.

"Pangu Wang table" and "three life" and so on are contained in the ancient times of the ancient Yue people Tianhuang's has invented the Heavenly Stems and Earthly Branches. The ancients used the Heavenly Stem and Earthly Branches as a carrier, the Heavenly Stem carries the Way of Heaven, the Earthly Branches carries the Way of Earth, and the Heavenly Stem and Earthly Branches are set up to match the movement of heaven and earth and the human resources. Ancient chronicle, chronicle month, day, time general Tian Gan Di Zhi, according to the calendar, according to the order of the twelve earthly branches projected, the fifth month that is "noon", noon noon day is called "heavy noon", and the noon day and the "yangchen ", so the Dragon Boat Festival is also known as "Duan Yang".

Expanded

The Dragon Boat Festival, the Chinese people more than two thousand years of traditional habits, due to the vast area, many ethnic groups, coupled with a number of stories and legends, so not only produced a large number of different names of the festival, but also has a different custom.

The contents of the main: daughter back to her mother's home, hanging Zhong Kui statue, welcome the ghost ship, avoiding lunch, the post of the afternoon leaf charm, hanging calamus, wormwood, swim in a hundred diseases, Pei Xiangbao, prepared for the sweet, dragon boat racing, martial arts, batting, swinging, to the children painted with andrographis, drinking andrographis, calamus wine, eat five poisonous cakes, salted eggs, rice dumplings, and seasonal fruits, and so on.

Baidu Encyclopedia - Dragon Boat Festival

China.com - Introduction to the Dragon Boat Festival