In ancient times, when China and other countries did not understand that the earth was a spherical celestial body, it is believed that the earth did not have this name. It was not until around the sixteenth century that people proved that the earth was just a planet orbiting the sun. Therefore, the Chinese name "Earth" must also be a product from that time. At present, we can only infer literally that the Chinese combined the "earth" of the "sphere" and called it "earth". Now we call other planets in Chinese what kind of stars they are, such as Mercury, Jupiter, etc., but the earth is not called the earth star. In fact, just like in Western foreign languages, Earth is the only planet that is not based on Greek or Roman mythology (for example, Mercury is Mercury and the Roman gods The situation named after the messenger). I believe this is because humans have a much longer history and affection for the planet Earth than astronomy.
Seventy-one percent of the earth is ocean, and only 29% is land. Logically speaking, it should be called a water polo. Because transportation was not developed at that time. People's activity range is small and the observation range is small. They see that there is a vast land around them, so they call the land we live in Earth