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- He invented a system of longitude and latitude and made a map of the known world. He also designed a system for finding prime numbers — whole numbers that can only be divided by themselves or by the number 1. This method, still in use today, is called the “Sieve of Eratosthenes.”
www.khanacademy.org/humanities/big-history-project/solar-system-and-earth/knowing-solar-system-earth/a/eratosthenes-of-cyrene
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Eratosthenes of Cyrene ( / ɛrəˈtɒsθəniːz /; Greek: Ἐρατοσθένης [eratostʰénɛːs]; c. 276 BC – c. 195/194 BC) was a Greek polymath: a mathematician, geographer, poet, astronomer, and music theorist. He was a man of learning, becoming the chief librarian at the Library of Alexandria.
Eratosthenes, Greek scientific writer, astronomer, and poet, who made the first measurement of the size of Earth for which any details are known. He was also the director of the Library of Alexandria. His only surviving work is Catasterisms, a book about constellations.
- The Editors of Encyclopaedia Britannica
- In addition to calculating Earth’s circumference, Eratosthenes created the Sieve of Eratosthenes (a procedure for finding prime numbers), tried to...
- Eratosthenes measured Earth’s circumference mathematically using two surface points to make the calculation. He noted that the Sun’s rays fell vert...
- Eratosthenes died in his 80s in Alexandria, Egypt. He had become blind in his old age and could no longer work by 195 BCE. He reportedly fell into...
Mar 3, 2022 · Eratosthenes (l. c. 276-195 BCE) was a Greek astronomer, geographer, mathematician, and poet best known for being the first to calculate the circumference of the earth and its axial tilt.
- Joshua J. Mark
- Eratosthenes (l.c. 276-195 BCE) was a Greek polymath best known as the first to calculate the circumference of the earth.
- Eratosthenes is famous for being the first to calculate the circumference of the earth.
- Eratosthenes is called the Father of Geography because he not only coined the term "Geography" but was the first to write a comprehensive work on t...
- The Greek philosopher Aristotle is credited with first calculating the size of the earth but the later polymath Eratosthenes' calculations were mor...
- Eratosthenes' primary influence was Academic Skepticism which encouraged people to think and judge for themselves instead of accepting common knowl...
Eratosthenes made a surprisingly accurate measurement of the circumference of the Earth. Details were given in his treatise On the measurement of the Earth which is now lost. However, some details of these calculations appear in works by other authors such as Cleomedes, Theon of Smyrna and Strabo.
More than 2,000 years ago Eratosthenes compared the position of the Sun’s rays in two locations to calculate the spherical size of the Earth with reasonable accuracy. Eratosthenes was born in the Greek colony Cyrene, now the city of Shahhat, Libya.
Eratosthenes was an Ancient Greek scientist born in the town of Cyrene in about 276 BC. Cyrene, then a Greek city, is now the town of Shahhat in Libya. Eratosthenes was educated in philosophy and mathematics in Athens.
Jul 3, 2019 · Eratosthenes of Cyrene (c. 276 BCE–192 or 194 BCE) was an ancient Greek mathematician, poet, and astronomer who is known as the father of geography.
