The origin of the year (about 40 words)

Nian is a demon in folk myths and legends. According to legend, in ancient times, Nian attacked villages at the end of the year and midnight. All the villages occupied by Nian were brutally slaughtered, and the horns on their heads were the weapons to kill. After the massacre, the annual meeting will eat everyone's heads.

In order to prevent someone from faking his death or escaping, he pretended to leave the village in 2000 and returned to slaughter survivors, even shaking the village violently. Even babies and children are not immune.

But once, Nian broke into a village and happened to meet a man dressed in red and burning a bamboo pole to keep warm. "Crack" exploded, red light shone, and Nian ran away in horror. Therefore, people know the nature of "year". Every year when the Year comes out, every household closes the door and stays at home. Put up red couplets, wear red clothes and set off firecrackers to catch up with the Year. Later, there was the "New Year". When Nian was driven away, people beat gongs and drums and called each other "Congratulations", which later evolved into "Happy New Year".

A year is the time for the earth to revolve around the sun once. The total length is 365 days, 5 hours, 48 minutes and 46 seconds, which is called "Tropic of Cancer Year". If we calculate by 365 days per year, every four years, there will be an extra 1 day.

Therefore, it is stipulated to increase 1 day every four years in February to make up for the lack of time. This year is a leap year. But in fact, it will lose a little every four years, and by 100, it will lose nearly 1 day, so this 1 day will not be added in the whole hundred years, but in the whole 400 years.

A year is also a cycle of climate change, and the climate changes from cold to hot, and then from hot to cold, which includes the whole process of people engaged in agriculture from farming to harvesting. People use this natural law as a big unit to calculate time.