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Eratosthenes of Cyrene (/ ɛr ə ˈ t ɒ s θ ə n iː z /; 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
- What were Eratosthenes’ major achievements?In addition to calculating Earth’s circumference, Eratosthenes created the Sieve of Eratosthenes (a procedure for finding prime numbers), tried to...
- What is Eratosthenes famous for?Eratosthenes measured Earth’s circumference mathematically using two surface points to make the calculation. He noted that the Sun’s rays fell vert...
- How did Eratosthenes die?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
- Who was Eratosthenes?Eratosthenes (l.c. 276-195 BCE) was a Greek polymath best known as the first to calculate the circumference of the earth.
- What is Eratosthenes famous for?Eratosthenes is famous for being the first to calculate the circumference of the earth.
- Why is Eratosthenes called the Father of Geography?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...
- Who first discovered the size of the earth?The Greek philosopher Aristotle is credited with first calculating the size of the earth but the later polymath Eratosthenes' calculations were mor...
- What was Eratosthenes' primary influence?Eratosthenes' primary influence was Academic Skepticism which encouraged people to think and judge for themselves instead of accepting common knowl...
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.
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. Eratosthenes was the first person to use the word "geography" and other geographical terms that are still in use today, and his efforts to calculate the circumference of the Earth and the ...
- Matt Rosenberg
Jan 14, 2020 · N.S. Gill. Updated on January 14, 2020. Eratosthenes (c.276 to 194 B.C.), a mathematician, is known for his mathematical calculations and geometry. Eratosthenes was called "Beta" (the second letter of the Greek alphabet) because he was never first, but he is more famous than his "Alpha" teachers because his discoveries are still used today.
276 BC. Cyrene, North Africa (now Shahhat, Libya) Died. 194 BC. Alexandria, Egypt. Summary. Eratosthenes was a Greek mathematician who is famous for his work on prime numbers and for measuring the diameter of the earth. View one larger picture. Biography. Eratosthenes was born in Cyrene which is now in Libya in North Africa.
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