The history of the perpetual calendar?

According to legend, a long time ago, a young man named Wan Nian saw that the festival at that time was chaotic and wanted to make it accurate. One day, he went up the mountain to cut wood and sat in the shade to have a rest. Inspired by the movement of the shadow, he designed a coffin to measure the sun and calculate the time. But it was raining and foggy at that time, which affected the measurement. Later, the dripping spring on the cliff aroused his interest, and he began to make five-story leaks. As time went on, he found that the length of the weather would repeat every 360 days. At that time, the monarch was called Zuyi, and the unpredictable weather made him very uneasy. In order to please the emperor, a minister named Aheng said that he would build a roof to worship the gods. Zu Ti thought it was reasonable, so he led officials to worship heaven, but to no avail. After 10,000 years of knowledge, I couldn't help but take the sundial and the clepsydra to see the emperor and explain to Zu Yi why the sun and the moon run. Zuyi was very happy after hearing this and thought it made sense. So I left for ten thousand years and built the Sun and Moon Pavilion in front of the Temple of Heaven, as well as the sundial platform and the Leaky Pot Pavilion. Twelve boys were sent to serve for ten thousand years. Zu Ti said to Wannian: "I hope you can accurately measure the laws of the sun and the moon, calculate the exact morning and evening time, and create a calendar to benefit the people of the world." On one occasion, Zuyi sent a message to Aheng, wanting to know the progress of the perpetual calendar. When he boarded the altar of the sun and the moon, he saw the inscription on the stone wall next to the Temple of Heaven: sunrise and sunset 360.

Start all over again.

There are four seasons when the vegetation is dry and glorious.

There are twelve circles in a year. When Ah Heng saw it, he knew that the study of perpetual calendar method was successful, and his heart was uneasy. He was extremely afraid that the monarch would blame himself for offering sacrifices to the gods, because he had been favored by creating calendars for thousands of years. So he plotted to send an assassin to get rid of Wan Nian. The assassin climbed to the Sun Moon Pavilion and saw the stars in the observation pavilion for thousands of years, so he drew an arrow with a bow and prepared to shoot him. Who knows, the assassin was found by the guards and arrested on the spot. When Zu Yi learned about this, he punished Aheng and personally went to Riyuege to visit Wannian. Wan Nian pointed to the astronomical phenomena and said to Zu Yi, "It's twelve months now. The old year has passed and the new year has begun again. Please make a festival for the monarch. " Zu Ti said, "Spring is the beginning of a year. Let's call it the Spring Festival. " Winter goes and spring comes, year after year. Later, after long-term observation and careful calculation, an accurate solar calendar was worked out ten thousand years later. When he showed his successor the solar calendar, he was covered with silver whiskers. The monarch was deeply moved. In order to commemorate the achievements of ten thousand years, he named the solar calendar "perpetual calendar" and named it the birthday star of the sun, the moon and the moon. In the future, people will hang up Shou Xingtu in China during the New Year, which is said to commemorate this venerable 10,000-year-old man. This is the origin of the perpetual calendar. Hope to adopt, thank you.