Eratosthenes


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Related to Eratosthenes: Eratosthenes Sieve
Eratosthenes
BirthplaceCyrene
Occupation
Scholar, librarian, poet and inventor

Eratosthenes

(ĕrətŏs`thənēz), c.275–c.195 B.C., Greek scholar, b. Cyrene. A pupil of CallimachusCallimachus,
fl. c.280–45 B.C., Hellenistic Greek poet and critic, b. Cyrene. Educated at Athens, he taught before obtaining work in the Alexandrian library. There he drew up a catalog, with such copious notes that it constituted a full literary history.
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 in Athens, he became (c.240 B.C.) head of the library at Alexandria. Known for his versatility, he wrote poetry and works (most of them lost) on literature, the theater (notably on ancient comedy), mathematics, astronomy, geography, and philosophy; he also drew a map of the known world and evolved a system of chronology. Especially noted as an astronomer, he is credited with measuring the circumference and tilt of the earth and the size and distance from the earth of the sun and the moon.

Eratosthenes

 

Born circa 276 B.C. in Cyrene; died circa 194 B.C. Greek scholar and scientist.

Eratosthenes was educated in Alexandria and Athens. He headed the library at Alexandria after the death of Callimachus and studied many branches of ancient science. In mathematics he discovered the famous method of finding prime numbers known as the sieve of Eratosthenes. He laid the foundations of mathematical geography; the first person to make an accurate determination of the size of the earth, he calculated the earth’s radius as 6,311 km. Eratosthenes contributed to the development of chronology and astronomy. In philology he produced a study of ancient comedy; his philosophical writings include the dialogue Platonicon. He also wrote on music. Only fragments of Eratosthenes’ works have survived.

Eratosthenes

?276--?194 bc, Greek mathematician and astronomer, who calculated the circumference of the earth by observing the angle of the sun's rays at different places
References in periodicals archive ?
This information will help Total and ENI -- and others -- to map out the area on the edges of Eratosthenes, previously unexplored.
While reading in the library, Eratosthenes had come across an account claiming that on the day of the summer solstice in Syene known today as Aswan the sun was reflected perfectly and in its entirety, deep in the earth at the bottom of a well, without so much as casting a single shadow on the walls of the structure.
During full Moon, point your telescope to the tract of mare just north of Eratosthenes.
Contractor name : CONSORTIUM LAND DEVELOPMENT 2: VECTOR CONSULTING ENGINEERS SA - ANONYMOUS GEOTOPES RESEARCH COMPANY - ERATOSTHENES CONSULTING SA - I.
82) makes a compelling case that Lysias 1, On the Murder of Eratosthenes, is quite probably a "fictional speech based on a fictional case, designed not only to instruct and to delight but, quite probably to advertise the logographer's skill.
The stars currently making up the constellation were first characterised by Eratosthenes as the pinchers or claws of the Scorpius shape.
Many of the ideas that we take for granted - latitude and longitude, climate zones and map co-ordiantes - date back 2,000 years or more to the Greek philosopher Eratosthenes and Romanera Egyptian Ptolemy.
Pear shaped or no, his conception of the Earth's size led him to conclude that the distance between western Europe and eastern China was entirely navigable, even though in the 15th century most experts agreed with the Greek mathematician Eratosthenes, who had concluded as far back as the third century that the Earth's circumference was approximately 25,000 miles (talk about genius, he was off by about 100 miles
Give me a few sticks and some shadows, and I will measure the Earth," said Eratosthenes in 250 B.
Pickering nearly a century later that changes in dark patches observed in and around the crater Eratosthenes might be attributable to the diurnal migration of swarms of lunar insects (Figure 7).
The prolific Greek mathematician and geographer Eratosthenes came to understand that the world wasn't flat when he calculated the circumference of the earth in the third century BC.