Is the equator circular or nearly circular, and what is the radius of the equator?

Nearly round. There are two versions of the shape of the Earth: (1) an ellipsoid with slightly flattened poles and a slightly bulging equator, and (2) a triaxial ellipsoid. What are the similarities and differences between these two statements?

The key to this problem: the equator is not a perfect circle, but an ellipse, so how many equatorial radii should there be?

Solution] Differences: In the first version, the equatorial radius is about 21 kilometers longer than the polar radius, forming an ellipsoid, which means that there are two axes. The second term indicates that it is a triaxial ellipsoid, which triaxes are it referring to?

Because of the results of artificial satellite observations, the equator is not a perfect circle, but an ellipse, then, the radius of the equator will not be the same length, but there are countless lines, some long, longer, very long, ,......There are shorter, shorter, shortest ......Now take the average long radius of the equator and the average short radius of the equator, so it becomes a triaxial spheroid such as the major semi-axis of the equator + the minor semi-axis of the equator + the minor semi-axis of the polar radius.

Similarities: All of these differences are small compared to the average radius of the Earth, so that the Earth is still a sphere from space, and both statements are roughly the same.

In reality, the earth has a larger belly and a shorter height.

And the equator is not a circle, it is a near-circle.

Of course it won't be a circle, it's a near-circle.

Of course, it's almost round! Ask you: Is the earth round?

Nearly round. Centrifugal force due to the rotation of the earth.

Make the "waist" of the earth bigger.

The equatorial radius is.

The radius of the equator is and the circumference is kilometers. The equator is the southern semi-pure Zen Zheng sphere, the northern hemisphere.

It divides the earth into two hemispheres, north of which is the northern hemisphere and south of which is the southern hemisphere, which is the baseline that divides latitude. The equator has a latitude of 0°, which is the longest latitude on Earth. At the same time, the equator is the acceleration of gravity on Earth.

The smallest place.

The climate and geomorphology of the equator are watching

The equator is a low pressure area, and the northeast and southeast trade winds blowing from both sides of the equator to the equator drive the sea water on the north and south sides of the equator to flow from east to west. The north is called the North Equatorial Warm Current, and the south is called the South Equatorial Warm Current.

When the equatorial warm current reaches the west coast of the ocean, it is blocked by land, and a small stream of it turns back to the east to form an equatorial countercurrent. Most of them are subject to geostrophic deflection forces.

The influence of the current, along the coast to the higher latitudes, to the mid-latitudes by the westerly wind to form a westerly drift.

When they reach the east coast of the ocean, part of them bends to lower latitudes along the west coast of the continent, becoming a compensating current for the equatorial warm current. The other part bends along the west coast of the continent towards high latitudes.

It constitutes the polar circulation.

Summary. Hello: dear, the equator is indeed a great arc, the following is the introduction of the equator:

The equator refers to the longest circumference in the trajectory of a point on the Earth's surface that rotates with the Earth. Its radius is and its circumference is kilometers. The equator is the dividing line between the southern hemisphere and the northern hemisphere, which divides the earth into two hemispheres, north of it is the northern hemisphere, south of which is the southern hemisphere, which is the baseline that divides latitude.

The equator has a latitude of 0°, which is the longest latitude on Earth.

Hello: dear, the equator is indeed a large arc, and the introduction of the equator is under the hungry code: the equator refers to the longest circumference in the trajectory of the point on the earth's surface with the rotation of the earth.

Its radius is and its circumference is kilometers. The equator is the dividing line of the southern hemisphere and the northern hemisphere, which divides the earth into two hemispheres, the northern hemisphere to the north, and the southern hemisphere to the south, which is the baseline that divides the latitude. The equator has a latitude of 0°, which is the longest latitude on Earth.

Because the equator is a circular arc, it can indeed be called a large arc like a shed. Here's what else the equator is: The equator is the dividing line between the northern and southern hemispheres and the zero latitude on Earth.

The equatorial region is tropical twice a year, with hot weather and high temperatures. The center of the equator coincides with the center of the earth, and its slag chain is also the longest weft coil on the earth, with a total length of more than 40,000 kilometers. Kiss.

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Any plane that intersects a sphere is a circle. However, among the intersecting circles, only the circle of the intersecting line passing through the center of the sphere is the largest, and its circle radius is equal to the radius of the sphere. This kind of circle on the sphere is called a great circle.

A section of this kind of circle is called a great arc.

Take the Earth, for example, every meridian on the Earth is a great circle. This is not the case with the parallel, in which nothing except the equator is a great circle.

Similar to the shortest line between two points on a plane is a straight segment, the shortest line between two points on a sphere is a large arc. Of course, it refers to a large arc that is no more than half as round as a trace.

If a large circle on the sphere is required to pass through or aurigo two known points, the method can be:

Take these two known points and the three points of the center of the sphere to make a plane and intersect the sphere.

1. The polar radius is the distance from the center of the earth to the poles, the length of the polar radius: 6, the radius of the equator is the average distance from the center of the earth to the equator, and the length of the radius of the equator: 6, kilometers.

2. The radius of the Earth's poles is about a kilometer shorter than the radius of the equator.

3. The equator, a geographical term, is the longest circumference in the trajectory of the points on the earth's surface that rotate with the earth. Its radius is and its circumference is kilometers. The equator is the dividing line between the northern and southern hemispheres, which divides the earth into two hemispheres, the northern hemisphere to the north, and the southern hemisphere to the south of the jujube, which is the baseline for dividing latitude.

The equator has a latitude of 0°, which is the longest latitude on Earth. At the same time, the equator is the place where the acceleration of gravity on Earth is minimal.

d The angular velocity of the Earth's rotation is equal everywhere, with a starvation of 15° hours, except for the north and south poles. Answer: Interview Qin's return to the case and choose D.

What is the radius of the Earth?

The radius of the Earth's equator is (a) 6378 140 km.

Polar radius of the Earth (b) 6356 755 km.

The average radius of the Earth r(3

a2b) km.

Chishi Sidao circumference (2 a) 40075 Gong Hong Songli.

The average radius of the Earth.

Thousands of nuclear pins.

Earth's equatorial radius.

Kilometers to travel. The radius of the Earth is extremely high.

The radius of the North Pole is shorter) kilometers.