Mathematician:Aristarchus of Samos

Greek astronomer and mathematician who used parallax to determine the relative distances of the moon and the sun.

His result was inaccurate, based as it was on faulty input data, but the method was sound.

One of the first to suggest a heliocentric universe.

Nationality
Greek

History

 * Born: 310 BCE, Greece
 * Died: 230 BCE, Greece

Inventions

 * Apparently invented a sundial in the shape of a hemispherical bowl.

Writings

 * c. 260 BCE: Περὶ μεγεθῶν καὶ ἀποστημάτων ἡλίου καὶ σελήνης (On the Sizes and Distances of the Sun and Moon)

Also see

 * : Chapter $5$: Eternal Triangles