Definitions

1. noun

A person who measures the sizes and distances of celestial bodies.

“The ancient Greek mathematician Hipparchus made significant contributions to the field of astronomy by accurately measuring the sizes and distances of celestial bodies.”

2. proper noun

A Greek astronomer and mathematician (190-120 BCE), known for his work on trigonometry and his discovery of the equinoxes.

“Hipparchus was a renowned astronomer and mathematician in ancient Greece, known for his contributions to the field of trigonometry.”