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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.
Eratosthenes (born c. 276 bce, Cyrene, Libya—died c. 194 bce, Alexandria, Egypt) was a Greek scientific writer, astronomer, and poet, who made the first measurement of the size of Earth for which any details are known.
- 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. He is also...
- 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...
Jul 3, 2019 · Learn about Eratosthenes, the father of geography who calculated the circumference of the Earth and invented the sieve of Eratosthenes. Explore his life, achievements, and legacy in this biography.
- Matt Rosenberg
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.
Sep 4, 2021 · Learn how ancient Greek mathematician Eratosthenes used geometry, a stick, a shadow, and a walk to estimate the size of the Earth 2,200 years ago. See how his calculations were close to the modern values and how he revolutionised map making.
Eratosthenes was a Greek mathematician who is famous for his work on prime numbers and for measuring the diameter of the earth. Skip to content MacTutor
