Who among the following was first to measure the circumference of the Earth?

Answer: Option A

Eratosthenes of Cyrene, 276 BC- 195 BC, was a Greek mathematician, geographer, poet, athlete, astronomer, and music theorist. He was the first person to use the word “geography” in Greek and he invented the discipline of geography as we understand it. He invented a system of latitude and longitude. He was the first person to calculate the circumference of the earth by using a measuring system using stades, or the length of stadiums during that time period (with remarkable accuracy).