ProofWiki:Mathematicians/Oenopides of Chios
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Mathematician, geometer and astronomer.
Little is known about him except that he came from the island of Chios, and is generally believed to have lived and worked in Athens in his youth.
Estimated the tilt of the Earth's axis with respect to the ecliptic as $24^\circ$.
Appears to have introduced the rule that all geometric constructions must be done with a straightedge and compass.
Contents |
Nationality
Greek
History
- Born: c. 490 BCE, Chios (now Khios), Greece
- Died: c. 420 BCE
Theorems and Definitions
- Perpendicular through a Given Point, documented as Proposition 12 of Book I in The Elements by Euclid.
- Construction of an Equal Angle, documented as Proposition 23 of Book I in The Elements by Euclid.
