The earth is the name given by ancient people.
There was no science in ancient times. Not everyone knew that the earth was called the earth. In ancient times, there was only one country and one country. The earth was the earth and was also called the earth star, just like Yinghuo and Ziwei, which were also called the earth star.
In fact, according to normal history, ancient people were far from controlling the entire earth. Even if some empires conquered the world, they only relied on an animal skin map, so the ancient people did not know that the earth was round. Don't know how big the earth is.
There is no unified name, it can be called the world, the world, the vast land, or in Taoism, it is called heaven and earth.
Extended information:
Due to underdeveloped science and technology, many legends and myths have been spread about the appearance of the earth. Human beings can only understand the earth through simple observation and imagination. For example, the ancient Chinese observed that "the sky is like a dome" and proposed the saying "the sky is round and the earth is round".
Based on the fact that the land they lived on was surrounded by the sea, the ancient people in the West believed that "the land is like a disk, floating on the endless ocean." Starting around the 8th century BC, Greek scholars tried to understand the earth through natural philosophy.
In the second half of the 6th century BC, Pythagoras proposed that the earth was a sphere. Two centuries later, Aristotle also proposed the theory based on natural phenomena such as lunar eclipses. He realized that the earth is spherical, accepted the views of his teacher Plato, and published the concept of "earth", but neither of them was reliably proved.
It was not until the 3rd century BC that the Alexandrian scholar Eratosthenes pioneered the radian measurement method of the meridian circle. He actually measured the latitude difference to estimate the radius of the earth's circle, which was the first to confirm the "round earth theory".
Later, Zhang Heng, an astronomer from the Eastern Han Dynasty of my country, gave a complete explanation of the "Huntian theory" in "Annotations on the Armillary Sphere" and also realized that the earth is a sphere. However, in his astronomical work " "Ling Xian" also said that the sky is round and the earth is flat. This shows that people at that time still had a very unclear understanding of the shape of the earth.
The name "Earth" comes from the Old English word "Eorthe". When people did not know that the earth was a planet, the word "Earth" just meant the land on which people walked. Later, it came to mean the earth on which people walked. The word came to mean not just the earth beneath our feet, but increasingly the world itself.