The concept of measuring any e representation on the face of the earth is termed as geodesy. Geodesy is the science that represents all kinds of measurements on the surface of the earth. Measuring the circumference of the earth is also a part of geodesy. There are various histories related to the ideas from the early ages that people have discovered or conceptualized about the figure of the earth and its measurements. The history of measuring various parts of the earth actually began in the Era of Enlightenment. There have been various arguments about the shape of the earth which was previously thought to be flat and it was conceptualise that Heaven is a physical do that spans over the Earth. There have been early arguments about the spherical Earth since the lunar eclipse was previously found to be formed in a circular shadow. This was valued argument because the word phenomenon as described can only be happening if the earth was spherical. In addition, the polar star or Polaris was always found to be appearing law when it was found that a person travels for the south. It was found that a person called Eratosthenes discovered or calculated the circumference of the earth even without having to leave Alexandria. He used to live in Alexandria and work as a chief librarian in the library of Alexandria. He is known for calculating the circumference of the earth and being the first of many people who tried to calculate the circumference of the earth. It was he who compare the angles in in the sky with the reference of a midday sun at two different places that were distance apart in the north and in the south. It was a remarkable phenomenon to witness as his calculation was accurate.
He actually calculated the actual circumference of the earth which was accurate. It was found that the circumference of the earth was 40,075 kilometres. He also discovered that the circumference of the earth is different around the poles and around the equator. This history about Eratosthenes is significant in the history of geodesy for the accuracy at that Eratosthenes had put forward without actually being away from his hometown and only by calculating the position of the midday sun. This is a remarkable incident as actually calculated the entire circumference of the earth positioning the local known summer solstice as the sun was directly overhead. Understood the fact that the shadow of someone looking down the well was blocked due to the reflection of the sun on the water and this is how we celebrated the elevation of the Sun and its angle at noon by using a vertical rod known as Gnomon. This entire incident made Eratosthenes the father of geography as he could easily calculate the circumference of the earth without even having the access to all technical details about the earth and getting out of his own country. The accuracy that he possessed about his measurements made one of the most significant incidents about measuring the different areas of Earth.
Additionally, it can also be said that the length of the shadow of the elevation of the sun's angle on the earth help in the calculation of making out the circumference of the earth. This is why it can also be put forward about the fact that primary and fundamental methods of measurements was capable of measuring such a huge area in the earth. The distance that was calculated taking earth as a spherical body concluded that the elevation of the angle was enough to calculate the circumference of the entire Earth. Due to this, it was also established that earth was not flat but a spherical body. The concept of Heaven was been challenged and historians claim that the entire distance that Eratosthenes head found out collaborated with the time that he took to travel from Syene to Alexandria with the help of a camel. There were many claims about how he found out the circumference of the earth but it was significant as an incident itself to establish many theories and ruin many earlier concepts about the shape and structure of the earth. This is why it was a remarkable and significant incident on the face of the earth. Earth was no longer to be considered as a flat body by logic and there would be no concept of a spherical body to be hovering right at the top of the world that was previously conceptualised to be the Heaven.
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