A movie that I know that it is hard to realize but I know that the earth is round

ByKevin Gill

It is common sense that everyone knows that the earth is a sphere, but when walking in practice the road is flat and it is difficult to notice that "the earth is round". YouTube channel providing educational animation series thereLife NogginIs a movie that makes it easy to see that the earth is not flat "This Is How We Know Earth Is not Flat"Is released to the public.

This Is How We Know Earth Is not Flat - YouTube


When you are living your everyday life, you will not often feel the curved surface of the earth.


That does not mean that the Earth is flat like a fantasy movie.


If you look at the city of Chicago from outside, if the earth is flat you should see the Rocky Mountains, the largest mountain range in America, across the city.


Actually I can not see the Rocky Mountains in the background of the city of Chicago because the Earth is a sphere.


Likewise, if you are looking at the ship departing from the harbor ... ...


When you see the ship disappearing on the horizontal line, you can see that "the earth is round".


The position of the horizon depends on where you see it. The limit of the horizon where a person whose height is 6 feet (about 180 cm) can be seen is about 3 miles (about 4.8 km).


The horizon seen from the top of the mountain somewhere will be visible to 100 miles (about 160 km) even by the same person.


It was about 2000 years ago that ancient Greek scholars noticed that the human race "the earth is round" for the first time. The scholars also seem to have gained the idea of ​​the structure of the earth by seeing the ship disappearing on the horizontal line of ancient Greece.


About 350 BC,AristotleHe seems to have noticed that the Earth is a sphere, as the shadow on the moon at the lunar eclipse drew an arc.


In addition, Aristotle also noticed that the stars visible are different depending on where you are.


About 100 years later, he was a Greek scholarEratosthenesEstimated the circumference of the earth. Eratosthenes is with Sien at the same timeAlexandriaHe said that he heard that only Alexandria buildings will be shadowed.


This is because the light of the sun floating in the sky hits the two cities located at different angles.


So Eratosthenes calculated the angle of the shadow extending from the stick on the ground of Alexandria. In addition, I calculated the approximate length of the round earth from the distances of the two cities.


If you have friends who are a bit far away, you can get the same experiences as Eratosthenes.


If you keep in touch at dusk on the phone and listen to the sunset, the sun will sink in the west, so you can see the sunset at different east and west.


The most obvious is the photograph of the Earth taken from the space station etc. The round circular earth with green and blue spreading is beautiful and you can easily see it on YouTube etc.