Eratisthenes 276 BC - 194 BC (mar 23, 194 – mar 23, 276)
Description:
They Calculated The Circumference of the earth and distance to the moon as well as the sun, the tilt of the earth axis and they also compiled a star catalog of 675 stars around us.They also invented longitude and latitude
(https://en.wikipedia.org/wiki/Eratosthenes)
Added to timeline:
Date:
mar 23, 194
mar 23, 276
~ 82 years