And if you have a friend at the same longitude, you can even measure its circumference.

About two thousand years ago, a Greek scholar named Eratosthenes used some sticks, shadows and math to calculate the circumference of the Earth. We enlisted friends in Hawaii and Missouri to help us ...

Impressively, Rusá actually cycled a distance further than the earth's circumference by around 15,000km. Even through freezing fog, Katarina didn't give up. The post How long does it take to ...

A 70-year-old man from Limerick is seeking the Guinness World Record for walking the equivalent of the Earth’s circumference in under 1500 days.

Every day, Mitchell and Chance venture out on a walk and, after eight years, they racked up more than 24,901 miles, which is the circumference of Earth.

An 88-year-old man has walked 24,900 miles, and plans to finish the final mile Oct. 3 to total the circumference of the Earth.