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How did eratoshenes measured the circumference of the earth essay

Eratosthenes is known for two major accomplishments in the field of mathematics: He computed this by using simple geometry and trigonometry and by recognizing Earth as a sphere in space.

He also knew the approximate distance between Alexandria and Syene, so he could set up this equation: New York and Boston: He created terminology that is still used today.

Eratosthenes was the first to give what is essentially the correct answer when he suggested that heavy rains sometimes fell in regions near the source of the river and that these would explain the flooding lower down the river.

The sunbeams shown as two rays hitting the ground at Syene and Alexandria. He is also said to have compiled a star catalogue containing stars. That would be amazing.

His measurement of the circumference of Earth was highly respected in his day, and set the standard for many years thereafter.

And they noticed the changing positions of the stars in the sky. Eratosthenes also measured the distance to the sun asstadia and the distance to the Moon asstadia.

It is by the Nile River and the Mediterranean Sea. Within about five years he became Chief Librarian, a position that the poet Apollonius Rhodius had previously held.

Now part of modern-day LibyaCyrene had been founded by Greeks centuries earlier and became the capital of Pentapolis North Africaa country of five cities: Our Solar System and Earth. Eratosthenes was a talented mathematician and geographer as well as an astronomer.

He also compiled a star catalog that included stars. In the Geography the names of over cities and their locations were shown: Alexandria is in northern Egypt.

According to Macrobious, Eratosthenes made the diameter of the Sun to be about 27 times that of the Earth. As head of the library Eratosthenes tutored the children of Ptolemy, including Ptolemy IV Philopator who became the fourth Ptolemaic pharaoh.

Our clients Below are the true reviews from people that already ordered from us: The actual polar circumference of Earth is just a bit over 40 thousand km about 24, miles. That meant the Sun was straight overhead. But, Eratosthenes neither had to use a compass necessarily; any vertical that is rotated around its own axle, form a perfect circle.

Eratosthenes reasoning was quite correct. It might have been one length, or it might have been another. When the chief librarian of the famous Library of Alexandria died in BCE, Eratosthenes was appointed to the prominent position around the age of Eratosthenes then spent some years studying in Athens.

Eratosthenes's contributions are still relevant today. If you cannot see the animation above, or it is not working properly, you may need to download the latest Flash player.

On the Summer Solstice, the Sun shone straight down the well to the very bottom. Unfortunately, the records of that are not very clear. A degree of latitude does not measure exactly the same in each place, but varies slightly from Eratosthenes compared the noon shadow at midsummer between Syene now Aswan on the Nile in Egypt and Alexandria.

Eratosthenes made a surprisingly accurate measurement of the circumference of the Earth. He sought to maintain the reputation of the Library of Alexandria against competition from the Library of Pergamum. Next, Eratosthenes used a bit more geometry to reason that the shadow's angle would be the same as the angle between Alexandria and Syene as measured from the Earth's center.

A century after Eratosthenes, the Greek astronomer Posidonius of Rhodes (c. –51 BCE) calculated the Earth’s circumference. Posidonius used the star Canopus as frame of reference: when the star is visible at the horizon in Rhodes, it is degrees above the horizon in Alexandria.

An ancient Greek mathematician calculated the Earth's circumference without ever leaving home. And it measured about 7 degrees.

If the Earth really was a sphere, Eratosthenes could use his. Eratosthenes is known for two major accomplishments in the field of mathematics: calculating the circumference of the Earth and what is now known as the "Sieve of Eratosthenes". To calculate the circumference of the Earth, Eratosthenes used the "approximate distance between Syene and Alexandria, as measured by camel /5(1).

Eratosthenes is known for two major accomplishments in the field of mathematics: calculating the circumference of the Earth and what is now known as the "Sieve of Eratosthenes".

To calculate the circumference of the Earth, Eratosthenes used the "approximate distance between Syene and Alexandria, as measured by camel-powered trade caravans" and the "angle of the shadow in /5(1).

The lad measured the circumference of the earth. Explain how Eratosthenes measured the circumference of the earth. He was told that at a certain time, the sun was going to line up perfectly perpendicular to a well that was located in Syene. So Eratosthenes measured the distance from Syene to his place in Alexandria.

Eratosthenes and the circumference of the earth Determining the distance between Alexandria and Syene wasn’t an easy task for Eratosthenes because at that time he didn’t have any measurement tools like the hodometer which was used by the Romans that can measure how much the wagon had traveled/5(1).

How did eratoshenes measured the circumference of the earth essay
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Eratosthenes of Cyrene (article) | Khan Academy