How an ancient Greek mathematician calculated the Earth's circumference. In the mid-20th century, we began launching satellites into space that would help us determine the exact circumference of ...

To get the last piece of the puzzle, Eratosthenes paid a guy to actually pace out the distance between the two cities. Et voila! He had all he needed to calculate the circumference of the Earth.

The idea of a spherical Earth was floated around by Pythagoras around 500 BC and validated by Aristotle a couple centuries later. If the Earth really was a sphere, Eratosthenes could use his ...

To get the last piece of the puzzle, Eratosthenes paid a guy to actually pace out the distance between the two cities. Et voila! He had all he needed to calculate the circumference of the Earth.

Believe it or not, this was the situation that Eratosthenes of Cyrene found himself in, some 2300 years ago, when he became the first person to not only conclude that the Earth was round, but to ...

50 comments telling me the earth is Flat. And hence, it’s compelled me to make a short video, with a history spin, because this is a belief that was meant to have died out more than 2,000 years ago.

By this means he found that the circumference of the earth was 250,000 stadia, according to Cleomedes, ... Nature - Eratosthenes and the Circumference of the Earth. Skip to main content.

Living around 250 BCE, Eratosthenes was the first to develop an accurate method for measuring the circumference of the Earth. And like all great theorists before and since, he didn’t even need ...