Eratosthenes of Cyrene Demographics:
- Born - c. 276 BC
- Birthplace - Cyrene (modern-day Libya)
- Died - c. 195 BC
- Place of death - Capital of Ptolemaic Egypt
- Nationality - Ancient Greek
- Marriage - Never married.
- Occupation - 3rd chief librarian, Great Library of Alexandria.
- Skills - Mathematician, athlete, geographer, astronomer, & elegiac poet.
- Invented the leap day.
- Developed system of latitude and longitude.
- First Greek to calculate the circumference of the Earth.
- Calculated the tilt of the earth's axis (with great accuracy).
- Calculated the distance from the earth to the sun.
- Created a map of the world (from available geographical knowledge of the time).
- Founder of scientific chronology.
- Produced a simple algorithm for finding prime numbers (known as the Sieve of Eratosthenes).
- Invented the armillary sphere.
- Wrote a treatise on the , an eight-year lunar-solar cycle.
- Said to have compiled a star catalogue containing 675 stars.
- Produced a map of the Nile's route to Khartoum.
- Good friend of Archimedes.
- Eratosthenes studied in Alexandria & subsequently Athens.
- His teachers included Lysanias of Cyrene (scholar), Ariston of Chios (philosopher) & Callimachus (poet & scholar from Cyrene).
- He settled in Alexandria in 255 BC after being asked to tutor Ptolemy III Euergetes' son Philopater.
- Appointed as librarian of the Alexandrian library (by Ptolemy III Euergetes I), after succeeding the second librarian, Apollonius of Rhodes.
- His writings also include the poem Hermes, which was inspired by the field of astronomy.
- Eratosthenes unfortunately became afflicted with blindness in his old age.
- He is reported to have committed suicide by voluntary starvation.
Eratosthenes' Mask for Primes (10x10)
Posted by ALCHEssMIST.
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