Is the Earth an oblate spheroid, is the Earth spherical?

Oooh. I almost thought it was "Is the earth tonsils?"

Because of the centrifugal force, matter moves towards the equator, so the Earth is an oblate sphere with an equatorial radius greater than the polar radius; Now the equatorial radius of the earth is measured to be 6378140 meters, the polar radius is 6356755 meters, the difference between the two is 21385 meters, and its flattening rate is 1.

The Earth is an oblate sphere that is created by the rotation of the Earth.

The equator is slightly bulging, and the poles are slightly flattened.

of the oblate sphere.

The Earth is an oblate sphere with an equatorial radius greater than the polar radius; Now the equatorial radius of the earth is measured to be 6378140 meters, the polar radius is 6356755 meters, the difference between the two is 21385 meters, and its flattening rate is 1.

The Earth's average equatorial radius is kilometers, the polar radius is kilometers, and the circumference of the equator and the perimeter in the meridian direction are 40,075 kilometers and 39,941 kilometers, respectively. Therefore, it can be said that the earth is an irregular sphere with slightly flattened poles.

In addition, measurements have found that the Arctic region is about a metre higher and the Antarctic region is 24.30 metres lower. The shape of the earth, it seems, is like a pear: its equatorial part bulges, which is its "pear body"; The North Pole is a bit pointed, like a "pear"; The South Pole is a bit concave, like a "pear navel", and the whole earth is like a pear-shaped rotating body, so people call it "pear-shaped earth".

To be precise, the Earth is a triaxial ellipsoid.

The shape of the earth, as the name suggests, is "spherical" shaped. However, the understanding of the shape of the "sphere" has gone through a considerable process. Fifth and sixth centuries BC, ancient Greece.

Philosophers start from the concept that the sphere is the most perfect, and believe that the earth is spherical. Around 350 B.C., the ancient Greek scholar Aristotle.

By observing the lunar eclipse, the first scientific demonstration of the Earth's sphere was based on the fact that the Earth's shadow on the Moon is a circle. Hui Shi, a philosopher during the Warring States period in China, has long put forward the idea that the earth is spherical. Portugal in 1519.

5 sea ships led by the navigator Magellan, with 3

years, completed the first voyage around the Earth, thus directly confirming that the Earth is spherical. Since then, people have unanimously referred to the world we live in as "Earth".

The Earth is not a standard sphere, but a slightly flattened spinning ellipsoid. Due to the rotation of the earth, every part of the earth is doing circular motion, under the action of inertial centrifugal force, the inertial centrifugal force at low latitudes is large, the inertial centrifugal force at high latitudes is small, and the inertial centrifugal force on the equatorial part is the largest, under the influence of inertial centrifugal force, the earth gradually expands from the poles to the equator.

The shape of the earth, that is, the shape of the earth. With the development of science and technology, people have a clear understanding of the shape of the earth: the earth is not a positive sphere, but an irregular sphere with slightly flattened poles and slightly bulging equators, with an average radius of 6,371 kilometers, a maximum circumference of about 40,000 kilometers, and a surface area of about 100 million square kilometers.

However, it has been a long process to get this correct understanding.

Mankind has been exploring for a long time, and Magellan was the first to achieve a circumnavigation around the world, confirming that the earth is a sphere. With the development of human science and technology and the application of modern detection technology, people finally discovered that the earth is an irregular sphere with slightly flattened poles and slightly bulging equators.

Well-developed scientific means have opened up a variety of avenues for earth surveying. Through measurements and analysis, people finally got the exact data: the average equatorial radius of the earth is kilometers, and the polar radius is kilometers.

The measurements also found that the Arctic region was about a metre higher and the Antarctic region was 24.30 metres lower. The shape of the earth, it seems, is like a pear: its equatorial part bulges, which is its "pear body"; The North Pole is a bit pointed, like a "pear"; The South Pole is a bit concave, like a "pear navel" ......For this reason, the earth is called the "pear-shaped earth".

To be precise, the Earth is a triaxial ellipsoid.

Answer]: B Due to the rotation of the earth, except for the earth's axis: the particles on the earth are all moving in a circular motion with the earth's axis as the center, so they all produce inertial centrifugal force, as long as the earth does not stop rotating, this force will always exist, and the direction of the force is perpendicular to the earth's axis and away from the earth's axis.

The inertial centrifugal force can be decomposed into two components, one is the component perpendicular to the earth's surface, and the other is the horizontal component, and the horizontal component force is directed to the equator, so the material on the earth has a tendency to move to the equator, so that the earth becomes a long sphere from a positive sphere. The shape of the Earth's oblate sphere is not fixed, it changes due to the change of the Earth's rotation speed, if the Earth's rotation speed becomes faster, the cardiac force of the limbs increases, and the sea water flows from high latitudes to low latitudes, and the Earth's eccentricity increases; If the Earth's rotation slows down, the centrifugal force decreases, and the ocean water flows from low latitudes to high latitudes, and the Earth's eccentricity decreases. Therefore, the correct answer to this question is B.

<> "The earth is not a standard sphere, but a circle and hail of an oblate sphere shorter than the yard yard between north and south, and the radius of the equator is 21 kilometers greater than the radius of the poles. So why is the Earth an oblate sphere?

Since the Earth is rotating, every part of the Earth is moving in a circle. This is the same as when the car is turning, the passengers are also moving in a circle. Experience tells us that when the orange sail car turns, the passengers have a tendency to dump away from the center of the circle, which is due to the action of the inertial centrifugal force of the passengers, so they also have a tendency to run out of the ground axis.

It has been proved in practice that the magnitude of the inertial centrifugal force on each part of the earth is directly proportional to its distance from the earth's axis, that is, the farther away from the earth's axis, the greater the inertial centrifugal force subjected to it. The equatorial part is much farther away from the Earth's axis than the poles, so the inertial centrifugal force on the equatorial part is greater than the two-pole part, making the Earth an oblate sphere with slightly flattened poles and slightly bulging equators.

The Earth is an irregular sphere. Due to the rotation of the earth, every part of the earth is doing circular motion, under the action of inertial centrifugal force, the inertial centrifugal force at low latitudes is large, the inertial centrifugal force at high latitudes is small, and the inertial centrifugal force on the equatorial part is the largest, under the influence of inertial centrifugal force, the earth gradually expands from the poles to the equator.

The Earth looks like a water ball from space, because the ocean occupies 71% of the Earth's surface area, and there are many rivers and lakes, so it looks like there is a lot of water on the Earth, but in fact the water is only distributed on the surface of the Earth, and the average depth is only five kilometers.

A brief introduction to the rest of the planet.

The Earth's atmosphere is mainly made up of nitrogen and oxygen. The tropics receive more solar energy than the polar regions and redistribute it through atmospheric and oceanic circulation. Greenhouse gases also play an important role in regulating the surface temperature.

The climate of a region is determined not only by latitude but also by factors such as altitude and proximity to the region and the ocean. Severe weather such as tropical cyclones, thunderstorms, and heat waves often occur in a wide area and have a great impact on life.

The earth is round.

The shape of the Earth's surface, which is made up of the Earth's solid surface and the liquid sea surface. It is based on the geoid and the shape of the earth is the shape of a continuous geoid plane. In ancient times, the scope of human activities was limited, and there was a lack of precise and reliable means of observation, and the intuition was that "the sky is round and the place is round".

With the development of human science and technology and navigation, the scope of activities has expanded, and the horizon has become increasingly broad. In particular, through a series of observations in which the earth is in a circular arc, the idea of a sphere is gradually formed. Especially since Magellan's successful voyage around the world, it has been established that the earth is spherical.

This transition from "flat" to "round" is the first leap in human understanding of the shape of the earth. After the 17th century, due to the development of observation methods, the earth was measured more accurately, and after it was found that the radius of the earth's equator was longer than the polar radius, it was further confirmed that the earth was not a positive sphere, but an ellipsoid. This shift from "spherical" to "ellipsoidal" is the second leap in human understanding of the shape of the earth.

In recent years, through the results of more precise determination of the shape of the earth by artificial earth satellites, it has been found that the ellipsoid of the earth is an irregular ellipsoid, a bit like a "pear", which is called a "pear-shaped body". This transition from an "ellipsoid" to a "pear-shaped" is the third leap in human understanding of the shape of the earth. It is also the latest human understanding of the shape of the earth.

The shape of the earth is geographically significant. Solar radiation is the most important source of energy on the Earth's surface. Because the Earth has an arc-shaped surface, the noon solar elevation angle varies from latitude to pole, gradually becoming smaller from the equator to the poles.

As a result, the solar radiation energy is unevenly distributed on the surface of the earth, resulting in the zonal distribution of the earth's heat, forming different temperature zones, and then leading to the zonal distribution of various natural geographical phenomena related to heat on the earth.

What would happen if the Earth was flat? After reading it, you will be glad that the earth is round.

Answer: The Earth is a sphere, but due to gravity, it is not a perfect sphere, and the equator is bulging outward, forming a "spare tire" structure. In fact, the polar radius of the Earth is kilometers, while the radius of the equator is kilometers.

Question: The earth is a circle, and when the northernmost of our earth is the North Pole and the southernmost is the South Pole, shouldn't they be connected?

The answer can be that the earth is round, to be precise, the earth is a slightly flattened ellipsoid, and to be more precise, the earth is a slightly pointed north pole, the south pole is slightly concave, and the equator is slightly bulging out of the shape similar to a pear. What we see with the naked eye thinks that the earth is flat, but in fact, the earth within the field of vision under our feet is an arc of the earth.

Yes, so can be thought of as well.

The questions are perfunctory. How far the South Pole is from the North Pole.

The North Pole refers to the northern end of the Earth's axis of rotation, which is the point at 90° north latitude. Antarctica, known as the Seventh Continent, is the last continent on Earth to be discovered and the only one uninhabited.

The Earth is not a positive sphere, but an ellipsoid, to be precise, an oblate sphere with slightly flattened poles and slightly bulging equators.

The Earth's South and North Poles are also asymmetrical, with the North Pole slightly convex and the South Pole slightly concave in terms of sea level.

Does the question mean that there is another side of the earth? There is another side of the South Pole and another side of the North Pole? If there is no slightly flattened sphere on the other side, then their center point is the north and south poles, but is the north and south poles supposed to be connected, or is the south pole the opposite side of a world that we have not discovered, another world that is similar to ours?

The Earth is a sphere, but due to gravity, it is not a perfect sphere, and the equator bulges outwards to form a "spare tire" structure. In fact, the polar radius of the Earth is kilometers, while the radius of the equator is kilometers.

The Earth is an irregular sphere with a slightly bulging equator and slightly flattened poles.

According to current scientific evidence, the shape of the earth is somewhat similar to the shape of the pears we see.

Since the earth is always in a state of revolution and rotation, centrifugal force is generated, and the length of its equatorial diameter (east-west direction) will be longer than that of the poles, so the poles of the earth are slightly flattened.

Of course, the difference between these two lengths is not visible to the naked eye, so the Earth appears to be a regular sphere.

Why is the Earth spherical?

Because of gravity. If not affected by external forces, all objects have a tendency to concentrate towards the center under the action of gravitational force. The most concentrated result is a spherical shape!

Although the surface of the earth is solid, it is also deformable because the solid particles are also mobile, which makes it possible to transform it into a spherical shape.

The activity of the Earth's internal energy makes the Earth irregularly shaped. However, the stones of the mountains are rolled down from a high place by the gravitational pull of the earth (gravitational pull), and the rivers carry sediment from the high places to the low-lying oceans (rivers also flow by the gravitational pull of the earth) ......These are all examples of concentration towards the center, and they all turn the earth from irregular to spherical. If the Earth's interior ceases to move, it is possible that in many billions of years the Earth will become a very standard spherical shape (with the exception of centrifugal force and the gravitational pull of other celestial bodies).

Many asteroids, due to their relatively small mass, lead to their own gravitational force is relatively small, and the star is generally composed of relatively hard solid rock, it is difficult to complete the process of moving to the center under the action of its own gravity, so their shape is strange, oval, rod-shaped, ......

It can also be said that because the earth is constantly rotating, inertial centrifugal force is generated, which makes the earth gradually expand from the poles to the equator, becoming a spinning ellipsoid with a slightly bulging equator and slightly flattened poles.

According to the results of artificial earth satellite observations, the equator resembles an ellipse, not a perfect circle, so the shape of the earth can also be considered a "triaxial ellipsoid". However, these differences are small compared to the average radius of the Earth, so the Earth can still be seen as a sphere when viewed from space.