Magellan's Circle of the World can indicate that the ground is a disc, but it cannot indicate that the ground is a sphere unless it spans the North and South Poles.
Why does the construction of railways, tunnels and bridges in any country and region in the world never need to consider the influence of surface ratio? (Note: Theoretically there is textbook, but it does not mean that it is necessary for actual operation)
The longest bridge in the world - the super-large railway bridge from Danyang to Kunshan section of the Beijing-Shanghai High-speed Railway, with a total length of 164.851 kilometers, and there is no curvature from the photos.
If the curvature of the earth exists, why don’t all engineers, architects, and surveyors need to consider the numerical and error issues related to the curvature of the earth?
For example, canals, railways, bridges, and tunnels are always cut into sections and placed horizontally. These projects are hundreds of miles long without the limitations of curvature on them?
If the Earth's curvature exists, why don't the pilots need to adjust the nose down frequently at all? Why does international flights do not have any Antarctic route?
In the Earth model, there will be an 8-inch drop every 1 mile, a 32-inch drop every 2 miles, a 72-inch drop every 3 miles, and a 20,000-inch drop every 51 miles, which is about 1667 feet.
However, the Canadian Lakeside Park is separated by , Lake Michigan and Chicago, USA, is 57 miles away. If the curvature of the earth exists, there will be a drop of about 2,200 feet between the two places. You cannot see or see any building, but in fact, every building can be photographed very clearly.
The arc of the earth cannot be found
If the earth is round, then the curvature of the earth will definitely be manifested in the natural landscape. But we can't see any curvature of the earth. The circumference of the Earth's equator is said to be 24,901 miles. This means that the horizon drops 8 inches for every square mile that extends. However, the arc of the earth cannot be found anywhere.
The circumference of the earth's equator is 40076 kilometers (24901 miles) and a radius of 6371 kilometers (3959 miles).
The formula for calculating the curvature of the earth is like this, multiplying 8 inches by the square of the distance. Assuming the circumference of the earth is 24901 miles, the formula for the expected amount of decline per mile is:
(quadratic of M)× 8=D
where "M" is the mileage of the observer from the ground, "8" is the number of inches falling per mile, and "D" is the distance of descending on the horizon.
recommends a website for calculating the curvature of the earth to you: https://www.metabunk.org/curve/.
If the earth is spherical, how far can a person look when standing? Assuming his vision is good enough, the distance he can see is 9.14 kilometers.
Samuel Burley Robosham (1816-1884), the founder of modern horizon theory, made the following explanation in the book "Empirical Astronomy: Earth Not a Globe" published under the pseudonym "Parata" in 1881.
If the earth is spherical and has a circumference of 25,000 miles, the surface of all stationary water must have a degree of bulge, and each part must be an arc. From any arc-shaped vertex, the straight line distance will be 8 inches of bent or downward slanted for every mile added. The second mile, the drop will be 32 inches, the third mile, 72 inches, or 6 feet. As shown in the following table:
The ground is flat
Kansas is flatter than pancakes
Kansas Geography Professor Mark Fonstad proposed: According to surveys, Kansas is flatter than pancakes. If 1.0 represents flatness, the pancake surface is 0.957, however Kansas has flatness in the 400-mile range of 0.9997. If the earth is a sphere, a 400-mile curvature should reach 20 miles.
In 2003, three university geography professors collaborated on an experiment to prove that Kansas is indeed flatter than pancakes. They measured 80,000 square miles of earth terrain and determined that the entire flatness of Kansas was 0.9997, while the pancake flatness measured accurately using laser microscope was 0.957, and concluded that the Kansas ground was flatter than the pancake. In 2014, a geographer at the University of Kansas published a paper titled "Flativity of the Ground in the United States". The survey results published in the paper showed that Florida , Illinois, North Dakota , Louisiana , Minnesota , Delaware
The ten flattest places in the world
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The ten flattest places in the world, Lake Baikal ranks fifth.
, Asia, Russia, Lake Baikal,
, Asia, Jordan , Wadi Rum Jordan
The largest flat land in the world
According to the data from GPS Global Positioning System , the overall change of the entire 4086 square mile area is less than 1 meter.This is impossible on a spherical earth, with the circumference of the earth being 25,000 miles. If the earth is round, there will be a change in curvature and it should bend as much as 6 feet after 3 miles.
Is the seabed flat?
The largest flat land in the world is Uyuni salt marsh in Bolivia? In fact, there is a larger flat ground than it, that is the deep sea plain. Not only is the water surface flat, but the ground flat, the deep sea bottom is also flat.
Abyssal Plain covers 50% of the total area of the earth and is the flattest and smoothest area. It covers 50% of the total area of the earth and is the flattest and smoothest area.
The deep sea plain is the gentle seabed in the depths of the ocean, and is the flattest and least developed area on the earth. It is usually located at a depth of 3000 to 6000 meters, between the continental shelf and the mid-ocean ridge, extending hundreds of kilometers wide. Its fluctuations are usually very small, with a difference of 10~100 cm per kilometer. The area of deep-sea plains is relatively large, generally extending for thousands of square kilometers, with a slope between 1:1000 and 1:10000, and a depth change of only a few meters.
In 1947, when geologists inspected the mid-ocean ridge of Atlantic , people discovered the deep sea plain. Deep sea plains are distributed in all oceans around the world. The Atlantic Ocean is the most distributed ocean in deep-sea plains.
New ZealandThe deep sea plain east of is probably the largest plain in the world. Its water depth is about 5500 meters.
The deep-sea plain in the central South China Sea is 1,500 kilometers long and 825 kilometers widest at the widest point. The terrain is slightly inclined from northwest to southeast. The water depth in the northern plain is 3,400 meters and increases to 4,200 meters to the south. The average slope is 0°10′～0°14′, and the northern terrain is flattering, with an average slope of only 0°04′～05′.
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