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Eratosthenes

(c.276–c.194 bc) Greekwriter on many subjects, born in modern Libya. He made the first known calculation of the Earth's circumference that was based on a scientifically sound ...

Eratosthenes

Eratosthenes (c.276–c.194 bc)   Quick reference

World Encyclopedia

Reference type:
Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
33 words

... ( c .276– c .194 bc ) Greek scholar who first measured the Earth's circumference by geometry. He administered the library of Alexandria and was renowned for his work in mathematics, geography, philosophy and...

Eratosthenes

Eratosthenes (c.276–c.194bce)   Reference library

The Oxford Encyclopedia of Ancient Greece and Rome

Reference type:
Subject Reference
Current Version:
2010
Subject:
Classical studies, History
Length:
852 words

... ( c.276–c.194 bce ), Greek scholar . Eratosthenes of Cyrene was a scholar in the diverse fields of mathematics, astronomy, geography, chronography, and literary history, as well as a poet, philosopher, and head of the library at Alexandria. After studying philosophy in Athens, he was called to Alexandria to be librarian by Ptolemy III and lived in Alexandria the rest of his life. Eratosthenes’ wide learning and interdisciplinary approaches led to novel treatments of old problems and in time his results became standard knowledge in many fields....

Eratosthenes

Eratosthenes (c. 276–c. 194b.c.e.)   Reference library

The Oxford Companion to World Exploration

Reference type:
Subject Reference
Current Version:
2007
Subject:
History
Length:
586 words

...at Alexandria. Until his death in 194 , Eratosthenes worked in Alexandria in the fields of poetry, philosophy, music theory, mathematics, astronomy, geography, chronology, philology, and history. Nearly all his works are lost, but more than 350 fragments survive in books by later Greek and Roman authors. Eratosthenes secured his place in the history of exploration with his accurate calculation of the circumference of the earth. As emerges from accounts by the astronomer Cleomedes and others, Eratosthenes’ method was based on simple proportion: he...

Eratosthenes

Eratosthenes (276–c.194)   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

... ( c . 276– c .194 bc ) Greek writer on many subjects, born in modern Libya. He made the first known calculation of the Earth’s circumference that was based on a scientifically sound method. According to tradition, he did this by measuring the Sun’s altitude as seen from Alexandria at the summer solstice, when he knew the Sun to be overhead at Syene, some 1000 km to the south. However, it is possible that he may actually have used a simpler method, which is to measure the amount by which the angle from the zenith to the horizon exceeded 90° as...

Eratosthenes

Eratosthenes (c.285–194 bc)(of *Cyrene)   Reference library

Peter Marshall Fraser

The Oxford Classical Dictionary (4 ed.)

Reference type:
Subject Reference
Current Version:
2012
Subject:
Classical studies, History
Length:
1,303 words

...the section on Eratosthenes was first published in 1909; Knaack , RE 6/1 (1907), ‘Eratosthenes’ 4; Fraser , Ptol. Alex. , index vol., 34, 100 ( = Fraser (1)), and ‘Eratosthenes of Cyrene’, Proc. Brit. Acad. 1970, 176–207 (with brief bibliog. 206–7) ( = Fraser (2)); R. Pfeiffer , Hist. Class. Scholarship (1968), 152–70 (esp. for literary works); K. Geus, Eratosthenes von Kyrene. Studien zur Hellenistischen Kultur- und Wissenschaftsgeschichte (2002). Literary criticism and scholarship C. Strecker , De Lycophrone Euphronio Eratosthene comicorum...

Eratosthenes

Eratosthenes (285–194)(of Cyrene)   Reference library

Peter Marshall Fraser

The Oxford Companion to Classical Civilization (2 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Classical studies, History
Length:
919 words

...works in this field, the Platonicus , mentioned above, and the Ariston (named after the Chian philosopher Ariston whom Eratosthenes had heard with some scepticism in Athens) were severely criticized by Strabo for their dilettanteism, but we know virtually nothing of their contents, and Strabo, as a good Stoic, was nettled by Eratosthenes’ disenchantment with his Stoic teachers. ( see stoicism .) Archimedes, in sending to Eratosthenes the text of his Methodus , called him ‘a leader of philosophy’ ( philosophias proestōs ), and there is no reason to...

Eratosthenes

Eratosthenes   Quick reference

Peter Marshall Fraser

Who's Who in the Classical World

Reference type:
Subject Reference
Current Version:
2003
Subject:
Classical studies, History
Length:
891 words

...whom Eratosthenes had heard with some scepticism in Athens) were severely criticized by Strabo for their dilettanteism, but we know virtually nothing of their contents, and Strabo, as a good Stoic, was nettled by Eratosthenes' disenchantment with his Stoic teachers. Archimedes, in sending to Eratosthenes the text of his Methodus , called him ‘a leader of philosophy’ ( philosophias proestōs ), and there is no reason to regard this as polite condescension. It seems likely that these philosophical writings belong to the pre-Alexandrian phase of Eratosthenes'...

Eratosthenēs

Eratosthenēs   Quick reference

The Oxford Dictionary of the Classical World

Reference type:
Subject Reference
Current Version:
2007
Subject:
Classical studies, History
Length:
279 words

... , of Cyrene ( c. 285–194 bc ), pupil of Callimachus (2) . After spending several years at Athens, he accepted the invitation of Ptolemy III Euergetes to become royal tutor and to succeed Apollonius 1 Rhodius as head of the Alexandrian Library. He thus became a member of the Cyrenaean intelligentsia in Alexandria, of which the central figure was Callimachus. His versatility was renowned and criticized, and the eventual Alexandrian rating was ‘B‐class’ (i.e. ‘next after the best specialist in each subject’), and as...

Eratosthenes

Eratosthenes (c.276––c.194 bc)   Reference library

Oxford Dictionary of Scientific Quotations

Reference type:
Quotation
Current Version:
2006
Subject:
Quotations
Length:
398 words

... (1948), 383 sources of the Nile Eratosthenes contends that the aim of every poet is to entertain, not to instruct. H. L. Jones (ed.), The Geography of Strabo (1917), Vol. 1 , 55 aim of every poet You [Eratosthenes] are wrong to declare that poetry is a fable-prating old wife, who has been permitted to ‘invent’ (as you call it) whatever she deems suitable for purposes of entertainment. H. L. Jones (ed.), The Geography of Strabo (1917), Vol. 1 , 59 poetry is a fable-prating old wife on Eratosthenes [Eratosthenes]...is a mathematician among...

Erato'sthenes

Erato'sthenes   Reference library

The Oxford Companion to Classical Literature (3 ed.)

Reference type:
Subject Reference
Current Version:
2011
Subject:
Literature, Classical studies
Length:
425 words

... 1. At Athens, one of the Thirty Tyrants , prosecuted by Lysias . 2. (of Cyrene, c. 285–194 bc ) The most versatile scholar of his time, who after spending several years in Athens became head of the Alexandrian Library . He was styled pentathlos , ‘all-rounder’ (properly, in athletics), and beta because he was next best to the leading ( alpha ) specialist in every subject (for these last terms see alphabet ). From philologia , ‘love of learning’, he coined to describe himself the word philologos , ‘scholar’. It is apt for one who was...

Eratosthenes of Cyrene

Eratosthenes of Cyrene (275–195 bc)   Quick reference

The Concise Oxford Dictionary of Mathematics (6 ed.)

Reference type:
Subject Reference
Current Version:
2021

...Eratosthenes of Cyrene (about 275–195 bc ) Greek astronomer and mathematician who was the first to calculate the size of the Earth by making measurements of the angle of the Sun at two different places a known distance apart. His other achievements include measuring the tilt of the Earth’s axis. He is also credited with the method known as the sieve of Eratosthenes...

sieve of Eratosthenes

sieve of Eratosthenes   Quick reference

The Concise Oxford Dictionary of Mathematics (6 ed.)

Reference type:
Subject Reference
Current Version:
2021

...sieve of Eratosthenes The following method of finding all the primes up to some given number N . List all the positive integers from 2 up to N . Leave the first number, 2, but delete all its multiples; leave the next remaining number, 3, but delete all its multiples; leave the next remaining number, 5, but delete all its multiples, and so on. The integers not deleted when the process ends are the primes. http://www.faust.fr.bw.schule.de/mhb/eratosiv.htm An interactive animation of the sieve of Eratosthenes used to obtain prime...

Eratosthenes of Cyrene

Eratosthenes of Cyrene ((c. 285–204 BCE))   Reference library

roller duane w.

Dictionary of African Biography

Reference type:
Subject Reference
Current Version:
2011
Subject:
History, Regional and National History
Length:
1,021 words

...Nevertheless, Eratosthenes remains one of the most profound scholars of antiquity, and his theorization about the size, shape, and formation of the earth, as well as his creation of a literary map of the inhabited world, was of great influence into modern times. bibliography Fraser P. M . “ Eratosthenes of Cyrene .” Proceedings of the British Academy 56 (1970): 175–207. The most recent biographical account in English of Eratosthenes. Geus Klaus . Eratosthenes von Kyrene . Munich: Beck, 2002. The most recent analysis of all of Eratosthenes’ works, in...

Eratosthenes of Cyrene

Eratosthenes of Cyrene   Quick reference

A Dictionary of Scientists

Reference type:
Subject Reference
Current Version:
2003
Subject:
Science and technology
Length:
332 words

... of Cyrene ( c. 276 bc –194 bc ) Greek astronomer Eratosthenes was born in Cyrene, now in Libya, and educated at Athens. He then taught in Alexandria where he became tutor to the son of Ptolemy III and librarian. He was prominent in history, poetry, mathematics, and astronomy and was known by the nickname ‘beta’ because, some say, he was the second Plato. In number theory he introduced the procedure named for him to collect the prime numbers by filtering out all the composites. The method, called the sieve of Eratosthenes , was to write down a...

Eratosthenes

Eratosthenes   Quick reference

New Oxford American Dictionary (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
41 words
Eratosthenes

Eratosthenes   Quick reference

Oxford Dictionary of English (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
58 words
Eratosthenes

Eratosthenes   Reference library

The Canadian Oxford Dictionary (2 ed.)

Reference type:
English Dictionary
Current Version:
2005
Subject:
English Dictionaries and Thesauri
Length:
45 words
Eratosthenes

Eratosthenes   Reference library

The New Zealand Oxford Dictionary

Reference type:
English Dictionary
Current Version:
2005
Subject:
English Dictionaries and Thesauri
Length:
47 words
Eratosthenes

Eratosthenes  

Reference type:
Overview Page
(c.276–c.194 bc)Greekwriter on many subjects, born in modern Libya. He made the first known calculation of the Earth's circumference that was based on a scientifically sound method. According to ...
Eratosthenes of Cyrene

Eratosthenes of Cyrene (c.276 bcc.194 bc)   Reference library

The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

Reference type:
Subject Reference
Current Version:
2009

... of Cyrene ( c .276 bc – c .194 bc ) Greek astronomer . sieve of ...

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