Eratosthenes, a Greek mathematician, geographer, and astronomer, was born c276 BC in Cyrene and died c194 BC. Cyrene, modern day Libya, was during time the center of knowledge and Eratosthenes received training in certain course at a young age. After receiving training in Cyrene, Eratosthenes traveled to Athens where he expanded his knowledge. During his time in Athens, he learned from and worked under many great mathematicians. Eratosthenes then traveled to Alexandria where he spent most of his adult life at and where he sadly passed away. His time in Alexandria he was appointed by Ptolemy III as the librarian for the Alexandrian Library and this is when he wrote about the world in his work called Geography and many other works (Masjid).
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In mathematics, Eratosthenes calculated the Earth’s circumference by measuring the shadow of different points in Syene and in Alexandria. He then compared those points to find the circumference of Earth which was nearly correct. He concluded the distance between Syene to Alexandria, the angle of elevation of the Sun, and these factors came together to help him conclude the circumference of Earth (Crystal). Another contribution Eratosthenes had in mathematics was his method that finds prime numbers called Sieve of Eratosthenes. This method helps with a way to find all prime number up to a specific integer (Torretti). Eratosthenes contributions to Geography was creating maps of the Rive Nile route, map of the known world during that time and he also came up with system of latitude and longitude (Russell). Also, an interesting fact about Eratosthenes was that he was the first to use the word geography (Crystal). Eratosthenes contributions to Astronomy was his star catalog that contained 675 stars, his invention of the Armillary sphere which is a mechanical device that helped with the demonstration and prediction of motions of the different objects in space, and some say he was measured the distance from Earth to the Moon and Sun (Masjid). The sphere is made up of ball that represents Earth or the Sun and many circles to represent the equator, ecliptic, meridian, and
In mathematics, Eratosthenes calculated the Earth’s circumference by measuring the shadow of different points in Syene and in Alexandria. He then compared those points to find the circumference of Earth which was nearly correct. He concluded the distance between Syene to Alexandria, the angle of elevation of the Sun, and these factors came together to help him conclude the circumference of Earth (Crystal). Another contribution Eratosthenes had in mathematics was his method that finds prime numbers called Sieve of Eratosthenes. This method helps with a way to find all prime number up to a specific integer (Torretti). Eratosthenes contributions to Geography was creating maps of the Rive Nile route, map of the known world during that time and he also came up with system of latitude and longitude (Russell). Also, an interesting fact about Eratosthenes was that he was the first to use the word geography (Crystal). Eratosthenes contributions to Astronomy was his star catalog that contained 675 stars, his invention of the Armillary sphere which is a mechanical device that helped with the demonstration and prediction of motions of the different objects in space, and some say he was measured the distance from Earth to the Moon and Sun (Masjid). The sphere is made up of ball that represents Earth or the Sun and many circles to represent the equator, ecliptic, meridian, and