190s BC births

Hipparchus (; , ;  BC) was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry, but is most famous for his incidental discovery of the precession of the equinoxes. Hipparchus was born in Nicaea, Bithynia, and probably died on the island of Rhodes, Greece. He is known to have been a working astronomer between 162 and 127 BC.

king of Parthian Empire from 165 to 132 BC

imperial envoy to the world outside of China in the 2nd century BC

2nd century BC Roman noblewoman, mother of the Gracchi

ancient Greek astronomer

Hypsicles (; c. 190 – c. 120 BCE) was an ancient Greek mathematician and astronomer known for authoring On Ascensions (Ἀναφορικός) and possibly the Book XIV of Euclid's Elements. Hypsicles lived in Alexandria.

son of Cato the Elder, jurist