Born around 276 B.C. in Cyrene, Libya, Eratosthenes soon became one of the most famous mathematicians of his time. He is best known for making the first recorded measurement of the Earth’s ...

Science teachers in a summer physics class at Southeast Missouri State University relied on shadows Thursday to calculate the Earth's circumference during the summer solstice, the longest day of the ...

Some days the world feels really big and some days it feels quite small, but as you might suspect, it doesn't actually change size. Here in the 21st century, we know the circumference, density, and ...

CC0 Usage Conditions ApplyClick for more information. About two thousand years ago, a Greek scholar named Eratosthenes used some sticks, shadows and math to calculate the circumference of the Earth.

THE advance of the Imperial armies to Cyrene recalls the time when that city was a home of learning and the capital of Pentapolis, a tract of country containing the five cities Cyrene, Arsinde, ...

Do you know how to measure the diameter of the earth? No? Then you’re less advanced than they were in 230 BC. You’re basically a Neanderthal with access to a microwave. Find out how to fix that in ...