How long is the radius of the earth, and how big is the radius of the earth?

The average radius of the Earth.

Kilometer. Earth's equatorial radius.

Kilometer. Short. The Earth is an irregular sphere, and the equator is the largest circle, so the average radius of the Earth is smaller than the radius of the equator.

What is the radius of the Earth?

There are three common values for the radius of the Earth:

Polar radius: The distance from the center of the earth to the north or south pole, about 3,950 miles (km) (the difference between the poles is negligible).

Equatorial radius: The distance from the center of the earth to the equator, about 3,963 miles (kilometers). Average radius:

Approximately 3959 miles (

km) is the average of the distance from the center of the earth to all points on the earth's surface. It can be found as follows: average radius = (equatorial radius 2 + pole radius) (1 3).

The radius of the Earth is sometimes used as a unit of distance, especially in astronomy and geology. It is usually denoted by re. The radius of the Earth is about kilometers.

The average radius of the Earth is about a kilometer.

The Earth's surface is divided into several hard parts, or plates, that move around the surface in geological time. About 71% of the Earth's surface is oceans, and the rest is divided into continents and islands. Oceanic Surveys include the Pacific Ocean and the Atlantic Ocean.

Indian Ocean, Arctic Ocean.

and the five large chain oceans of the Southern Ocean and their affiliated seas. The coastline is 10,000 kilometers long.

The approximate radius of the Earth is kilometers, and the diameter is kilometers and the key is old. Q: How big is the Earth?

Answer: The total area of the Earth's surface is 510067860 square kilometers. The area covered by the Earth's inflated water is estimated to be 10,000 square kilometers, which is about 10,000 square kilometers.

The average radius of the Earth is about 3,959 miles (kilometers).

Earth's radius. Refers to the transition from the center of the Earth to its surface (mean sea level.

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The Earth is not a regular object. First of all, it is not a positive sphere, but an ellipsoidal sphere, to be precise, an oblate sphere with slightly flattened poles and slightly bulging equators; Secondly, the north pole and north pole of the earth are also asymmetrical, in terms of sea level, the north pole is slightly convex, and the south pole is slightly concave; Third, the Earth's external topography is undulating (which has an impact on measuring the Earth's radius).

Due to the rotation of the earth, the uneven density of the interior, and the tidal forces outside.

Causes the shape of the Earth to deviate from the spherical shape. At the same time, the local topography increases the uniformity of this non-agglomeration difference, which makes the surface conditions of the earth extremely complex. To facilitate processing, the description of the Earth's surface must be simpler than it actually is.

So we built a minimal model of the Earth's surface that would meet the needs.

All of these commonly used models involve the concept of "radius" [1]. Strictly speaking, only spheres in a three-dimensional figure have a concept of radius, but in many areas, including models dealing with the collapse of the earth, the use of "radius" is extended. Here's how accurate it is.

Descending Earth Model:

the true surface of the earth;

a geoid defined by mean sea level at each point of the real surface;

For geoid and ellipsoids, the definite distance from any point on the model to a specified center is referred to as "a radius of the Earth" or "the radius of the Earth at a point". The "average radius" of the sphere model is also commonly used as the "radius of the earth". On the other hand, the "radius" corresponding to the real surface of the Earth is of no practical use.

On the contrary, it is the altitude relative to sea level that has a practical purpose.

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The length of any radius of the Earth falls between the polar radius, which is the smallest at about 6,357 km, and the equatorial radius, which is about 6,378 km, the largest. Hence the shape of the earth.

The deviation from a standard sphere is only about 1 in 300, which in most cases makes the Earth a sphere sufficiently to be considered and the term "Earth radius" is used. This concept can also be generalized to other major planets, but with a difference in the flattening rate.

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