Sacrifice to Heaven

Sacrifice to Heaven (Jitian 祭天) is the worship of Shangdi originating in China. In Ancient Chinese society, nobles of all levels constructed altars for Heaven. At first only nobles could worship Shangdi but later beliefs changed and everyone could worship Shangdi.
Modern Confucian organizations offer this practice to all their followers, and it's still observed in China even though there is no monarch. This tradition has also had an impact on other countries such as Japan, Vietnam, and Korea. The Chinese word "Jì" (祭) in the name of this practice is the same word as "Jesa" in Korean.
History.
This practice has its roots in the Shang dynasty, but during the Zhou dynasty, it was only allowed for the Son of Heaven due to the teachings of Shendao shejiao. Two specific sacrifices, Sacrifice to Heaven and Feng Shan, were exclusive privileges during that time. The Temple of Heaven has been the location for this ritual since the Ming dynasty, and it still takes place there today.
Some people think that Qing's involvement in the ritual resulted in the standardization of Manchu rituals through the book of Manchu rites, but this theory is not supported. In the early years of the Republic of China, Kang Youwei's Confucian movement proposed separating Religious Confucianism from the state bureaucracy, so anyone could perform the Sacrifice to Heaven as per the Christian model.
Nowadays, this ritual is performed without a monarch, and it can take place at locations other than the Temple of Heaven. For example, it was performed in Fujian in 2015.
Korea.
In Korea, Sacrifice to Heaven is read as Jecheon (Hanja: 祭天). It is also identified with the word yeonggo 영고 (迎鼓) and has a history linked to Korean shamanism, in addition to Chinese influence
Japan.
In Japan Sacrifice to Heaven is called "Saiten" (祭天) . It is done for Amaterasu rather than Shangdi though.
Every year, the festival of Niiname-no-Matsuri (新嘗祭) happens and most peopledo not know it has Chinese origins. The first Niiname-no-Matsuri of the reign of an Emperor is called a Daijosai.
Vietnam.
In Vietnam Sacrifice to Heaven is called Nam Giao.
It was first done by Emperor Đinh Bộ Lĩnh .
Nam Giao was the most important ritual of the Nguyễn dynasty.
In the Nguyen Dynasty, the Esplanade of Sacrifice to the Heaven and Earth was made to sacrifice to heaven It was made in 1807 and sacrifices were done there until 1945 In 2002 people started doing it again. It is done in Festival Huế every two years.