Eratosthenes
![Etching of an ancient seal identified as Eratosthenes. {{ill|Philipp Daniel Lippert|de}}, ''Dactyliothec'', 1767.](https://upload.wikimedia.org/wikipedia/commons/f/fa/Eratosthenes_profile.png)
He is best known for being the first person known to calculate the circumference of the Earth, which he did by using the extensive survey results he could access in his role at the Library. His calculation was remarkably accurate. He was also the first to calculate Earth's axial tilt, which has also proved to have remarkable accuracy. He created the first global projection of the world, incorporating parallels and meridians based on the available geographic knowledge of his era.
Eratosthenes was the founder of scientific chronology; he used Egyptian and Persian records to estimate the dates of the main events of the Trojan War, dating the sack of Troy to 1183 BC. In number theory, he introduced the sieve of Eratosthenes, an efficient method of identifying prime numbers and composite numbers.
He was a figure of influence in many fields who yearned to understand the complexities of the entire world. His devotees nicknamed him ''Pentathlos'' after the Olympians who were well rounded competitors, for he had proven himself to be knowledgeable in every area of learning. Yet, according to an entry in the ''Suda'' (a 10th-century encyclopedia), some critics scorned him, calling him ''Number 2'' because he always came in second in all his endeavours. Provided by Wikipedia
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21by Eratosthenes
Published 1880
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22by Eratosthenes
Published 1899
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23by Eratosthenes
Published 1822
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24by Eratosthenes
Published 1872
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25by Eratosthenes
Published 1880
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26by Eratosthenes
Published 1899
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27by Eratosthenes
Published 2010
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28by Eratosthenes
Published 2010
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29by Eratosthenes
Published 1964
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30by Eratosthenes
Published 2007
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