Eratosthenes
E196028
Eratosthenes was an ancient Greek polymath best known for remarkably accurately calculating the Earth's circumference and for devising the sieve method for finding prime numbers.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Eratosthenes canonical | 12 |
| Eratosthenes of Cyrene | 5 |
| Greek geographer Eratosthenes | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1704235 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Eratosthenes Context triple: [Hellenistic period, notableFigure, Eratosthenes]
-
A.
Aristarchus of Samothrace
Aristarchus of Samothrace was a prominent Hellenistic Greek scholar and head of the Library of Alexandria, renowned for his critical editions and commentaries on Homeric poetry.
-
B.
Aristarchus of Samos
Aristarchus of Samos was an ancient Greek astronomer who proposed a heliocentric model of the universe, placing the Sun at the center and the Earth in motion around it.
-
C.
Eudoxus of Cnidus
Eudoxus of Cnidus was an ancient Greek mathematician and astronomer renowned for developing the method of exhaustion and an influential geometric model of planetary motion.
-
D.
Hipparchus
Hipparchus was an ancient Greek astronomer and mathematician renowned for founding trigonometry and creating one of the first comprehensive models of the motions of the Sun and Moon.
-
E.
Hipparchus of Athens
Hipparchus of Athens was a 6th-century BCE Athenian tyrant of the Peisistratid family, known as a patron of the arts and for his assassination, which became a celebrated event in Athenian democratic lore.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Eratosthenes Target entity description: Eratosthenes was an ancient Greek polymath best known for remarkably accurately calculating the Earth's circumference and for devising the sieve method for finding prime numbers.
-
A.
Aristarchus of Samothrace
Aristarchus of Samothrace was a prominent Hellenistic Greek scholar and head of the Library of Alexandria, renowned for his critical editions and commentaries on Homeric poetry.
-
B.
Aristarchus of Samos
Aristarchus of Samos was an ancient Greek astronomer who proposed a heliocentric model of the universe, placing the Sun at the center and the Earth in motion around it.
-
C.
Eudoxus of Cnidus
Eudoxus of Cnidus was an ancient Greek mathematician and astronomer renowned for developing the method of exhaustion and an influential geometric model of planetary motion.
-
D.
Hipparchus
Hipparchus was an ancient Greek astronomer and mathematician renowned for founding trigonometry and creating one of the first comprehensive models of the motions of the Sun and Moon.
-
E.
Hipparchus of Athens
Hipparchus of Athens was a 6th-century BCE Athenian tyrant of the Peisistratid family, known as a patron of the arts and for his assassination, which became a celebrated event in Athenian democratic lore.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
ancient Greek mathematician
ⓘ
astronomer ⓘ geographer ⓘ human ⓘ librarian ⓘ poet ⓘ polymath ⓘ |
| areaOfInfluence |
Mediterranean world
ⓘ
linked to:
Ancient Mediterranean world
|
| canonized | as a foundational figure in geography and number theory ⓘ |
| countryOfCitizenship |
Ancient Greece
ⓘ
linked to:
Greek Antiquity
|
| dateOfBirth | c. 276 BC ⓘ |
| dateOfDeath | c. 194 BC ⓘ |
| describedAs |
Beta
ⓘ
second only to the greatest scholars of his time ⓘ |
| educatedAt | Athens ⓘ |
| employer | Library of Alexandria ⓘ |
| estimatedValue | Earth's circumference close to modern value ⓘ |
| ethnicGroup | Greek ⓘ |
| fieldOfWork |
astronomy
ⓘ
chronology ⓘ geography ⓘ literary criticism ⓘ mathematics ⓘ |
| influenced |
development of number theory
ⓘ
later geographers ⓘ later mathematicians ⓘ |
| influencedBy | Greek mathematical tradition ⓘ |
| knownFor |
calculation of the Earth's circumference
ⓘ
creation of one of the earliest maps of the known world ⓘ early use of parallels and meridians in geography ⓘ invention of the Sieve of Eratosthenes ⓘ work on the chronology of Greek history ⓘ |
| languageOfWorkOrName | Ancient Greek ⓘ |
| memberOf |
intellectual community of Alexandria
ⓘ
linked to:
Library of Alexandria
|
| nativeLanguage | Ancient Greek ⓘ |
| notableIdea |
systematic sieve for finding prime numbers
ⓘ
use of a prime sieve up to a given limit ⓘ |
| notableWork |
On the Measurement of the Earth
ⓘ
Sieve of Eratosthenes ⓘ
linked to:
Eratosthenes spiral
|
| placeOfBirth |
Cyrenaica
ⓘ
Cyrene ⓘ Libya ⓘ
linked to:
Tripolitania
|
| placeOfDeath | Alexandria ⓘ |
| positionHeld | chief librarian of the Library of Alexandria ⓘ |
| sexOrGender | male ⓘ |
| timePeriod | Hellenistic period ⓘ |
| usedMethod |
geometric reasoning to estimate Earth's circumference
ⓘ
measurement of sun angles at Syene and Alexandria ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Eratosthenes Description of subject: Eratosthenes was an ancient Greek polymath best known for remarkably accurately calculating the Earth's circumference and for devising the sieve method for finding prime numbers.
Referenced by (18)
Full triples — surface form annotated when it differs from this entity's canonical label.