## Eratosthenes

E·ra·tos·the·nesUse **Eratosthenes** in a sentence

275?-195? ; Gr. geographer, astronomer, & mathematician

## Eratosthenes

Third century BC.

Greek mathematician, astronomer, and geographer who devised a map of the world, estimated the circumference of the earth and the distance to the moon and the sun, and constructed a method for finding prime numbers.