# Mathematician:Oenopides of Chios

## Mathematician

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 $24^\circ$.

May have introduced the rule that all geometric constructions must be done with a straightedge and compass.

Greek

## History

• Born: c. 490 BCE, Chios (now Khios), Greece
• Died: c. 420 BCE