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Person

Hipparchus

A man with curly blonde hair and a full beard, dressed in a draped brown garment, stands against a dark background, evoking the appearance of ancient Greek attire.

Greek astronomer and mathematician (c. 190 – c. 120 BCE), often called the founder of trigonometry. He worked on Rhodes and produced the first known catalogue of stars, measured the precession of the equinoxes, and developed a quantitative theory of the Moon's motion that the Antikythera Mechanism's lunar gear-train appears to embody. The Mechanism is sometimes attributed to his school.

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