What is Eratosthenes?

Outline of Eratosthenes In this article I will introduce Eratosthenes' life, his life, death, and all we know. He is a diverse, versatile thinker, also known as the "father of geography" (Fashchuk 1). Eratosthenes' Lifetime Eratosthenes was born in 276 BC. In Cyrene of Libya, it is now Shahhat of Libya on the coast of northern Africa. He died in 194 BC. It is 82 years old in Egypt, Alexandria, which is the second largest city in Egypt (Trubin). The only thing his father said was a man named Aglaos.

Eratosthenes is a mathematician and a geographer. He developed a way to find prime numbers called world maps, sieves of Eratosthenes, and estimated the circumference of the earth. His way involves determining the direction of Alexander Sun at noon of the summer solstice and comparing it to the vertex of Syene (swan) about 500 miles away from the sun. This is the result of the world high school entertainment activity by Eratosthenes experiment and the picture of the method to experiment by oneself.

The famous measurement of Eratosthenes (the oldest measurement of the size of the earth, the survival of the details) took place in the 3 rd century BC. Eratosthenes uses, at noon of the summer solstice, the sun is directly in Syene (a small town in the upper reaches of the Nile River in Egypt's modern Aswan), on the same day in Alexandria the sun is more vertical It means that it is below. One-tenth of a circle (7.2 °). The distance between Alexander and Syene is estimated to be 5000 caverns and the surrounding length of the earth is 50 × 5000 = 250,000 caverns (about 45,000 km, or 28,000 miles). The exact value of 'stade

Egyptianist Egyptologist in the 3 rd century BC and Hellenistic era was the head of the Alexandrian library where he studied and wrote various themes. During his study, Eratosthenes learned that the sun did not cast a shadow at the noon of Syene's summer solstice. Eratosthene observed that the sun shadowed from Alexandria and measured that the sun was at the highest point in the sky when the sun and the zenith were tilted about 7 degrees. Eratosthenes knows that he can measure the circumference of the earth by measuring the distance between Alexander and Shane, assuming the sun is at the highest point of both cities. Since 7 degrees is 7/360 yen, the distance between Syene and Alexander must be 7/360 (or equivalent to about 1/50) around the earth.