Hipparchus
From Memory Alpha, the free Star Trek reference.
Hipparchus (ca. 190-120 BC) was an Earth astronomer.
He was one of six Human astronomers honored with a monument located in front of the Griffith Observatory, the others being Galileo Galilei, Nicolaus Copernicus, Johannes Kepler, Isaac Newton and William Herschel. (VOY: "Future's End")
