What is the radius of the earth?

Radius of the earth refers to the distance from the center of the earth to its surface, that is, the radius length of the earth, which is about 637 1 km.

637 1 km (km) This is obtained by ignoring the topography of the earth's surface and the earth's atmosphere. Understanding radius of the earth requires understanding the structure and shape of the earth. The earth is a sphere-like celestial body, which is composed of rocks, atmosphere and water.

The shape of the earth is caused by its rotation and gravity. These forces make the shape of the earth neither a complete sphere nor a complete ellipsoid, but a certain flatness. The radius of earth survey is based on the observation of the earth's surface and the understanding of the earth's shape.

In early surveying, people used triangulation and other geometric methods to calculate the radius of the earth. Now, with the development of science and technology, we use more accurate satellite positioning system and radar technology to accurately measure radius of the earth.

Radius of the earth is of great significance to many fields. For example, in geography, it can help us better understand the characteristics of the earth's surface, climate change and geological structure. Radius of the earth is also one of the important parameters in the planning and design of communication, meteorology, aerospace and other fields. In addition, it is also used to calculate the physical characteristics of the earth such as mass, volume and density.

Characteristics of the earth:

1, the earth is our home, it is the third planet in the solar system. When you look at the earth from space, it is mostly water, so the earth is also called the planet of water.

The shape of the earth is similar to a sphere. Due to rotation and gravity, the earth presents an ellipsoid with slightly flattened ends. The rotation direction is from west to east, and the rotation period is one day and night.

3. The earth's surface consists of ocean and land, of which ocean accounts for 765,438+0% of the earth's surface area and land accounts for 29%. There are many forms of the surface, including mountains, plateaus, plains, basins, canyons, rivers, lakes, oceans and coastlines. The formation of these topographical and geomorphological features is due to the interaction of many factors, such as the movement of earth plates, geological processes, climate and hydrological cycles.

4. The climate and weather of the earth are the result of the interaction of solar radiation, earth rotation, atmospheric movement and other factors. Due to geographical location, altitude, climate type and other factors, the climate and weather in different regions are different. For example, areas near the equator usually receive more solar radiation, so the climate is hotter, while areas near the poles are colder.