In the heyday of ancient Yao and Shun more than 4,000 years ago, when Yao was in power, he worked diligently for the people and did many good things for the people, which was deeply loved by the people. However, due to his son's incompetence, he did not pass on the leader of the "tribal alliance" to his son, but passed it on to Shun, who has both ability and political integrity.
Yao said to Shun, "You must pass on the throne in the future, and you will be relieved when I die." Later, Shun passed the throne to Yu, who made great contributions to flood control. Yu also loves the people and has done many good things for the people like Shun, and is deeply loved by the people. Later, after Yao's death, people took the day of offering sacrifices to Heaven and Earth and the first emperor Yao as the beginning of the year, and called the first day of the first lunar month "New Year's Day" or "Jacky". It is said that this is the origin of the ancient Chinese New Year.
On New Year's Day, emperors of past dynasties held ceremonies to celebrate and pray, such as offering sacrifices to gods and ancestors, writing couplets on doors, writing blessings and dancing dragon lanterns. Folk activities such as offering sacrifices to gods and buddhas, ancestor worship, posting couplets, setting off firecrackers, observing the New Year, having a family reunion dinner and numerous "social fires" have gradually formed.
Through long-term observation, the ancient Egyptians found that the time of Nile flooding was regular, so they recorded this time on bamboo poles every time, and learned that the time between the two floods was about 365 days apart. At the same time, they also found that when the Nile came near Cairo at high tide today, the sun and Sirius just rose from the horizon at the same time.