There was a saying: “Gentlemen have peace but disagree, vile characters(小人) agree but have no peace.” This sentence means that cultivated(有教养的) people work in harmony(和谐), but they don’t just blindly agree with what others say; common people agree easily, but they don’t really work together.

Imagine you are having a group discussion in class. You have a different idea from your classmates. Will you speak out or just agree with them to avoid argument? Sometimes people give up their ideas to stay in agreement with others. But is this real harmony? Confucius(孔子) talked about this before. In his opinion, things don’t have to be the same, people can keep their differences in a peaceful atmosphere(氛围). For example, in a chorus(合唱), different voices—high and low—together make harmonious singing, that’s real harmony.

China welcomed the idea of “harmony in diversity(和而不同)” thousands of years ago. Even before Confucius, Yan Ying of the Spring and Autumn Period first talked about the idea. Today, President Xi Jinping calls on people to communicate equally(平等地), learn from each other, and make progress together, so we can give something good to the whole world.

Greenwich (格林威治) is on the River Thames, five miles away from the middle of London, and it has a two-thousand-year history. The first English people were fishermen there, and they named the place Greenwich, meaning “green village”. Later the English kings and queens lived at Greenwich in their beautiful palaces.

The name of the earliest palace was Placentia. Its windows were made of glass—the first in England. Henry VIII lived there. He knew that England must be strong at sea. So he started two big ship yards (船坞) at Greenwich, and for 350 years the ships which were made there were the best in the world.

But trouble was coming to Greenwich. In 1649, a war started in England and for eleven years there was no king. The men who had worked for him at Placentia decided to live in the palace themselves. They sold all its beautiful things, and bought small pieces of the palace garden with money. Finally the war ended and King Charles II came back. But Placentia was falling down. So King Charles built a new and bigger palace, which is now open to the public.

At that time, Charles was worried about losing so many of its ships at sea; their sailors didn’t know how to tell exactly where they were. So in 1678, Charles made John Flamsteed, the first astronomer (天文学家) in England, try to find the answers. Flamsteed worked in a new building on the high ground in Greenwich Park. From it with a telescope which he made 15 himself, Flamsteed could watch all around the sky. And he did, night after night, for twenty years. Continuing Flamsteed’s work a hundred years later, an astronomer called Harrison finally made a clock which told the time at sea, and helped sailors to know where they were. You can see Harrison’s clock, still working, in Greenwich’s museum. Because of both men’s work, every country in the world now tells its time by Greenwich time.